I'm sorry for whatever hard things in your life that you are handling. If you "disappear" from a boyfriend for 3 weeks, then it doesn't sound like you two are very committed to each other.

I agree with the poster above about him seeming to be over-involved with other women. But - to me - it sounds like you are under-involved with him. It may be that you need to move on. Sometimes two people cling to a poor relationship just to have some security. It's not a good idea.