Has this ever happened to y’all?

So my boyfriend and I are on wonderful terms right now. Deeply in love. Can’t let go each of other, miss each other the minute we’re separated. I basically live with him since I’m here at his place all the time if I’m not at work or home. So the sex has always been fucking amazing lol, it always is, but these past few weeks, he’s been cumming hella fast. And I don’t mean like minute man, I mean like as soon as he puts his dick in, he wants to cum already. He tells me he really does want to make love but he just gets too exited but it usually never happens until these past couple of weeks. I’m just wondering if this is something common? Like is it just a little stage he’s going through? I’ve never experienced this with anyone before lol so I’m just a little confused.