Not sure where to start

So my bf and I have been together for about 2 1/2 years now. Shortly after we started dating I caught him talking to another girl. Iv been cheated on before but he just was always very clear that he wouldn't tolerate cheating because of exs in his past. I was crushed. Then not too long ago I saw a text pop up on his screen with no contact saying I miss you so I didn't go through his phone but I wrote down and called the number (honestly thinking it was family or something) and a girl answered. We talked and she was sweet about it but told me everything. He expected me to be ok with it like 2 days later. I told him it would take time for me to be ok with intimacy and trusting him and after two weeks he freaked out because any time we would talk about having sex all I could see was her. Then things got a bit better again we talked and he was understanding that I needed more time until one day I noticed he was on his phone a lot and he knows that bothers me when we are spending time together so that night while he was sleeping I went full snoop mode and found that he had a kik hidden in a folder of useless apps. So since then I have been taking screen shots of his convos. I never told him I knew and I'm not going to. We live together with two roommates rent is coming up and he is unemployed. I don't want him to end up on the street but idk how much longer I can pretend to be ok. I'm trying to discretely pack my shit and start to move it to my dads but I don't know where to start or what to do and over our relationship I don't talk to like any of my friends so I have no one to turn to and I need help :(