Ladies ever felt this way

Só me and I significant other be having sex but I notice that I suck his dick he goes crazy and then when we fuck is like it goes well but he falls asleep so fast right at the moment when I’m about to cum boom he gets tired and falls asleep lmaooo. I love him so much I enjoy our sex but I just want to know why is it that when we fuck he falls asleep so fast and gets tired before me like dammmmm lmaoooo is this a bad thing? Or not am I boring ?