We have been together for three years. We had a rough patch and over a year ago separated and he went to date a guy in which he said he was trying to "get over me" and talked to another guy and came back to me. It has almost been a year and he will not even commit to saying e is my boyfriend. The more resistant he is the more resentment I have towards him and it causes a lot of arguments. What to do?

Talk to him amd ask him why he is so resistant. If you love him stay but at the same time you have to face the possibility of gettig hurt.