Is he going to leave me?

My boyfriend and I have been together for over 3 years. For the most part, I felt secure and extremely happy in my relationship until October of last year when I found out he has cheated on me. I forgave him and he made a huge effort to make amends. Recently, I have moved in with him temporarily until I move back to the U.S (he is British and I could not obtain a working visa after college). We have lived together for month and I leave in a few days. He told me that he would save money while I was gone and bring me back to marry him and until then, would visit me in the states. However, since I moved in with him, he hasn't been interested in me sexually at all and we never hang out. He's just as affectionate as ever but I get a vibe that he can't wait for me to leave.