My boyfriend doesn't cum when we have sex or when i give him a blow job. He finishes himself off, and also when i watch him wank he cums just fine, and seems to have a great orgasm with it.
He doesn't drink, smoke or touch drugs, is fit and healthy, and has no worries. We have great sex, apart from his not cumming. We are both in our late 30's, so we aren't beginners. And i dont let on that it bothers me, so theres no pressure there.

He used to cum with his ex, which makes me feel even more inadequate.

Is it me?

Or do you think he's not over his ex?