<human>: I found out my boyfriend of three years cheated on me. I want to break up. When I found out, I confronted him and he told me his reasoning and it made sense. I had moved out and we had been growing a part and were barely ever talking and he cheated on me then broke up with me the day after. We got back together three months later and he didn't tell me what happened. When he told me (after I found out but not from him confessing) I was furious but I understood why. 

I've now decided I can't move past it. He cheated and I can't be a doormat for this guy anymore. Problem is, he just spent a couple hundred on plane tickets to go on vacation for the end of next month. Also another couple hundred for a car and a deposit for a hotel.  I feel bad but I'm not sure if I should just refund him the money for my ticket and my half for everything else? I just know I need out. Like yesterday. Any advice would be really really helpful. Thank you.

Can you give me the gist of the text in a nutshell?
<bot>: bf cheated. Ima break up. He spent a lot of money on a vacation. Not sure what to do.