He cheated on me with my sister. UPDATEs And DNA RESULTS

I am so angry right now, I have no idea what to do. We’ve been together for 7 years and they’ve been having an affair behind my back for 5 years, 5 FUCKING YEARS!!! She’s got 3 children 2 under the age of 5 and now I wonder if he’s their real father. My head is all over the place. I love my sister kids so much but I can’t help but think...

What do I do? Help!

Also, ANOTHER thing to add. I found out that my mom knew about it the whole time!!! I’m so beyond pissed.

UPDATE- convinced them to get DNA tests done, either way I’m leaving. Haven’t eaten or slept in 3 days. He tried coming to my house and talking but I told him to leave, I can’t look at him or my sister anymore. Just want this all to end.

UPDATE 2- DNA results tomorrow. I honestly don’t know if I want to hear the out come. I’d be fucking devastated cause he was never able to get me pregnant so if he got my fucking sister pregnant then I am going to lose my shit big time.

UPDATE 3- my dad has turned up at my house stating he didn’t know anything about it, I asked to see his phone and seen that he really didn’t know anything. Messages between him and mom saying he’s disgusted with her. I cried to him for hours and he tried making me something to eat but I honestly couldn’t eat anything. I feel physically so sick with the idea that he’s been with my sister and then with me on the same day.

What do I do if the DNA results are negative? That he’s not the father to any of the kids?

How do I get passed this? How do I not feel like I want to kill myself? I’m losing everything over something that’s not my fault, my mom, my sister my nieces and nephew, my so called partner. How? How can someone be betrayed to the highest and lose everything? Because right now I honestly don’t want to live anymore.

UPDATE 4 & DNA RESULTS- he’s the father to all three kids with a 99.8% probability!!!! It’s taking every bit of me to not kill them both for this, the oldest child is 6 so they lied to me saying that its been 5 years when in fact it’s been 6/7 years. So the whole time we’ve been together he’s been with my sister. I told my sisters boyfriend who has been with her for 12 years, he’s going to live with me now (he’s got no where else to go) hoping that we can help each other through this.

UPDATE 5- ok this sounds really bad but me and my sisters boyfriend were so upset and vulnerable last night that we kissed, I felt absolutely horrible about it. We both agreed that it was wrong and talked after. I told him he can stay as long as he wants but still needs to find somewhere else eventually because I’m not going to be that girl. I’m not going stoop to that level.

UPDATE- so I really couldn’t handle this anymore, I went to her house. I knew the kids were in school so I knew she was on her own. She opened the door and she just stood there looking at me waiting for me to say something. This rage just came out of no where, I fucking grabbed her by her hair and dragged her outside. I was ready to fucking kill the bitch. She was saying ‘please don’t, he doesn’t want me anymore he only wants you’ I couldn’t give a fuck what she was saying. I fucking beat the shit out of her, Iv done it before and I know she just lays there crying like a little bitch. I was screaming at her letting all my anger out, then guess who turns up... the fucking ex of mine. Begging for me to stop and saying all this crap about how he still loved me and didn’t mean for it to get this far. I got off my sister walked towards my car then turned back around and just full on punched him in the face and then got in my car and drove home and he followed me, I got in my house and locked my doors as he was banging on my door to let him in. I have always stuck up for myself, and I know violence doesn’t solve anything but fuck me I feel a lot better now.

EDIT & UPDATE- I don’t appreciate people saying I’m a troll and that Iv made this whole thing up. I really fucking wish this was all fake but it’s not, this is my life now. So thank you very much for making me feel worse about the situation.

Her ex boyfriend who was staying with me for a while has gone back to her and she has supposedly “left” my ex because he doesn’t want those kids to be his. My mom has always tried getting in contact with me saying that she had to keep it to herself because my sister was threatening her that she would never see her grandkids every again if she told me and they mean everything to her. So I understand her position but also doesn’t excuse what she did. To the person who asked how I found out, it was through my other sister who walked in on them kissing whilst I was in work. She did say that he was trying to push her off. But she told her everything and then she told me. But at the moment he’s trying to contact me constantly and wants to explain himself. Not sure if I want to hear it but for my own closure I might consider it.