too long to cum!?

My boyfriend and I have sex frequently and I've been feeling a little insecure lately. when we have sex he takes so long to cum that I usually have to give him a BJ to make him cum or sometimes he doesn't cum at all and it makes me feel like I suck. we also just reunited after being in a long distance relationship for 7 months so we had been having phone sex (meaning he had been masturbating), does that play a part in it ? how should I feel about this ? can anyone help !?