Sex takes two people.

From what I read, your partner is being very selfish & your sort of letting him get away with it. (probably without realising)

Have you told your partner how you feel?

I only just recently brought up the "sex talk" with my husband. He was cummimg really quickly, without even thinking about giving me an orgasm. It was all so "one sided" and I didn't even think that he thought of me, which in turn made me not want sex at all. (amongst other things, eg. Medication alters my libido, tired looking after my 8 month old etc.)

Please tell your partner how you feel.

Good luck ;-)