Boyfriend doesn't cum

so me and my boyfriend had sex and usually he cums in like one minute . But now he doesn't cum anymore . Like I had sex with him two weeks ago and he didn't cum and I had sex with two days ago and he still didn't cum. But he gets rock hard . I feel A way . I told him that I feel a way and he says it's because he didntwant to cum . I don't find it true because theyre time I don't want him to cum because he finishes to early but now all of sudden you can hold your cum back? My question is , how do I feel about this? & can boys hold their cum?