Stuck between 2 men! Confused!!!!

OK so I have a friend that I’ve known for about almost 20 years and throughout the years that I’ve known him he was with the same girl. Him and I Have always been in relationships At the same time. In 2016 we both got out of our relationships and we tried the relationship together. It didn’t quite work out. And so a couple months after him and I broke up we still remain friends but then I met a guy which was my brother’s best friend and we got together and I fell in love. My brother never introduced me to any of his friends because he didn’t want any of his friends hurting me. My friend got out of his relationship and called me and come to find out my fiancé and my friend both know each other from when they were teenagers. So when my friend found out who I was with he told me that I shouldn’t be with him and that it’s not gonna be good because he knows the guy and of course I didn’t pay no mind to it because I am a stubborn person and I had to find things out for myself. Well I started finding things out and I told my friend about my relationship and that was a big mistake. Everything that I told my friend he remembered and in February 2017 he told my Fiancé that I didn’t want to be with him anymore because I wasn’t liking how I was treated, and I didn’t like that he didn’t come home every night and I would look to his phone when he came home and find all kinds of text messages from different girls and talking about having sex with them and everything so I was really hurt and mind you my fiancé was on drugs and doing the most. I gave him a chance and my friend told me that I shouldn’t that I was dumb if I did but I still didn’t listen. And at this point I really didn’t know what I wanted, I loved my fiancé but I did not agree with anything he was doing. I went to school every day came home took care of my grandma took care the kids and waited for him to come home he be gone for days at a time. Well when my friend told my fiancé about our relationship and my fiancé moved out I tried talking to him telling him not to leave and don’t jump the gun on things but he did and he left not knowing where he was going to go. I tried telling him wait let’s talk, he didn’t he wanted to leave. And that was all on his birthday February 8 of last year and on February 21 we had gone to a casino, which was good, and he was going to come back home but then he never made it back home because he decided to go on a police chase and called me at 2 AM to tell me he got arrested. He told me not to talk to my friend anymore because he is the one that got us into this mess and why he’s in jail. I told him that he can’t be blaming other people for his actions but to this day he still does. Well my fiancé’s been in jail since February 21 of last year and is barely going to be getting out July 4, 2018. I love him I love the person he has become but it’s “jail talk”I believe. My brother and everybody has told me that when men are in jail and they have their Girl waiting for them on the outside because they talk a good game about how their going to change their life around and they want to do better for everything but then when the time comes for them to get out they always go back to their old ways. That’s what I’m afraid of with my fiancé as him going back to his old ways and people warning me about it. Well I have been seeing my friend off and on for the past year and we have really close and we have gotten into arguments to where he said that he was going to write my fiancé a letter and tell him what was going on. He was going to tell him that him and I were seen each other and everything he could think of to tell him. Welllll come to find out he never ended up writing the letters and I ended up telling on myself. My fiancé was upset that I was talking to him again and I don’t blame him. So about two weeks ago my friend gave me an ultimatum and I really wasn’t expecting this, because we tried being together before and it didn’t work out and I think that after a few years we kind of both grew up and I ended up falling for him this time around. I’m so confused as to what I want to do and I feel like I need to give my fiancé a chance but I’m scared at the same time of him going back to his old ways. My friend told me he was going to give me a few more days to see what I want to do and since we’ve been spending so much time together I started to fall for him which wasn’t supposed to happen. I love my fiancé but I don’t know if I’m in love with him still because of him being gone for so long. I’ve been by my fiancés side the whole time. Didn’t ever break up with him I was always there for him. But when I’m alone in thinking to myself and my heart is going towards my friend I’m never been in a situation like this and also never been with anybody that has gone to jail while being together. My friend still waiting for an answer but I feel like I need to give my fiancé a chance but then I don’t want to lose the chance with my friend. I am so confused as to what I’m gonna do I started falling in love with my friend and I’m scared to lose both of them. I just need some advice and see what other people would too.

Update***** I dropped my friend and when my fiancé gets out I’m picking him up and gonna talk to him face to face. I can’t go backwards and keep the same cycle, I have 2 teenage girls that are watching my every move. And this is the best thing I can do, I don’t want them finding some like I had.