Feeling real low and confused... :(

My boyfriend and I have always been rocky. But I love him so I always let things work out. We moved in together and I really wish we hadn't. Isnt out first time just our first time alone.

I'd been having feelings hes been talking to other women. Hes a big one for social media and always allows girls to add him on facebook and instagram. I told him i didnt want him having snapchat, because of the fact everything is so hidden.

His sister and him got into an argument and she blurted out about him "talking to bitches on snapchat" I checked thru my contacts and he got it.

She then fessed to me he confessed to him and showed her he was talking to a girl on instagram...

And then she told me that their friend told her he is also talking to one of our employee friends, tho that girl lies a lot im not doubting the story.

I feel stuck. My heart is breaking and I wanna hurt him so bad and then im sad because I'm losing a low life pos. I hate love. I never wanted to love someone so I wouldnt have to feel this. Im stuck in a 1yr lease with him and we are a 1 room studio so no separate living space. I cannot afford to live on my own and pay a whole car payment plus bills and rent:\ part of me says to bullshit the relationship till lease is up and just use him till I can leave. Another part of me says to leave him flee. I feel so fucked:'(