Fiancé Had a Baby with another woman and I knew nothing..💔

Story time— I met the perfect man a year ago in January, he was a handsome car sales man who found me while I was searching for a car. He was perfect.. everything about him.. we connected immediately and after about two months we became inseparable. We slept together, woke up together, drove to work together, showered together, ate together.. it seemed unhealthy how connected we were. It’s hard to explain but he was my best friend over anything else and it happened so fast. I told him everything..literally everything...and I thought he did the same well PLOT TWIST. So he has a twin who lived with us and his twin brother has a girlfriend right? Well me and his brothers girlfriend become best friends and I have her Instagram logged into my phone. This is how I woke up one day and my whole life changed💔 I woke up and there was a message on my phone from her Instagram that said “tell ******* his son is here if he cares to see him before we leave”

Mind you I read this message right next to my boyfriend, but I felt I didn’t have enough information for confirmation yet... this day I was suppose to take his brothers girlfriend to work so I hurried up and got dressed and told her that we had to go immediately. She put shoes and a coat on and we got in the car where I handed her the phone and her first reaction was “NO.”

She was in just as much disbelieve as me. She egged the newly found babymom for information ( the new babymom is my boyfriends “high school sweetheart” and she has been around a few times before me this is how my “sister in law” even knew about her) well as my sister in law was trying to get more information the girl said the baby was born “last week”.. so I thought about it for hours (as my boyfriend was at work that whole day) and finally decided I would just goto his house take all my stuff and leave him a screen shot and a note saying “go see your son” as followed

I blocked him on everything besides the Xbox app which he can reach out to me on... he quickly discovered this and messaged me confused. His story is that they had sex before me in December (we got together in January) he did not plan a baby with her... but he found out about the baby in February and told her he didn’t want it... she was going to get an abortion but then decided it was wrong to do that and she told him she was going to keep the baby but he didn’t have to worry about it. Basically because she wanted the baby and he didn’t. Therefore, he deemed the baby nonexistent and did not tell me about it. I have been working for the last year everyday to fall in love with this man and invest in him... now everything seems fake and like it was a lie. I am confused I don’t know what to do... if what he says is true I could bring myself to make it work but I still hate the fact that he has a son he is not going to take part in... but I also can’t get the fact that she said the baby was born “last week” which means he would of had to cheat on me.. i want to reach out and talk to her myself but I feel like it isn’t even worth it. I am 19 years old, no children, 2 jobs, full time student at a private university and almost to law school. I know I am better than this but I just keep finding myself in his bed and now I can’t help the anxiety of feeling stupid because I’m having sex with him unprotected so he could get me pregnant. This is so confusing he was my best friend and when I am away from him he feels like a stranger but when I’m with him everything feels fine. Has anyone been through something like this before and can give me advise or knowledge on how to proceed? I’m hurting so bad it’s making me stupid and numb. I don’t want to keep seeing him but I can’t help feeling like I’m giving up on him when I walk away... i really hope someone out there has similar experiences and can help me..