Relationship has been eating me alive

My boyfriend and I have been together for a little over a year.

In the beginning he showed so much love, brought me Starbucks often, wrote me love letters, was very reassuring and messaged me plenty. Out of nowhere it slowed down to nothing and i decided to look at his phone and he has been messaging a girl that he dated in his home country about how beautiful she was, saving her pictures in his hidden folder, etc.

He was crying and promised never again and he’ll do ANYTHING to prove his love to me.

Now here we are again. We haven’t had sex in two months, whenever I cry about how I miss him and he doesn’t even call me beautiful or touch me he tells me I’m being annoying. He won’t cuddle me. NOTHING.

He refuses to work on our relationship then tells me that he DOES love me, that I just expect him to do everything I tell him (I asked him for love letters again and for him to at least be more touchy, but he said I’m asking for too much).

Then I asked him to promise me to never cheat on me again, his response was “I can’t promise that. I’m a human. We change, I don’t know about the future”

I used to be so in love with him, now I’m crying every day. I moved in with him, my job is right next to our apartment, what do I do? What is going on? I hate him, I love how he used to be…