Help!

Me and my boyfriend broke up a while ago and we reconnected and got back to together about a month ago but ever since we got back together I haven't been able to connect with him sexually.i give him head and stuff when he asks but when it comes to sex I hate it I just lay there I feel no attraction to it at all .but because of this he wants to leave and keeps saying how there is someone better then me and that I am not good enough and now I dont know what to do .any advice ??!???!?