<human>: So my (Now ex)boyfriend and I have been together for 5 years and we have two kids together. I just found out a couple days ago that he's been on and off with the same girl for 4 years now. She knew all about me and my children. His whole family knew as well, except for his mom. 

Right now I'm feeling beyond broken. I've never cried so much in my life. I'm feeling sad, angry, humiliated, you name it. I wish there was some way I could make him feel what I'm feeling right now. I wish I could go kick her ass. I'm just a complete mess.

Ever since I found out he's been begging for me to forgive him. He told me it was just sex, that's all he ever wanted out of her. He's saying that he'll do anything, we mean the world to him, she was nothing. And I want nothing more then to say "Yes, I forgive you, now come home." But I know I can't. 

So basically what I'm asking is, how can I get over him? I want to forgive him so bad, but I just can't this time. It's so hard because I have to keep seeing him no matter what, we've got kids. I just have no idea how I'm gonna stick to my guns.

Can you provide a brief overview of the text?
<bot>: Boyfriend of 5 years has been cheating on me with the same girl on and off for 4 years. How can I get over him?