I feel like my man never cums??

So whenever we have sex it kinda feels like he’s coming and he says he does but I never actually feel it. I’ve had sex before him and have physically felt my partner cum, I mean... yeah.. and then it usually leaks out afterward. With him I never feel anything leak out. Is he just lying to me to make me feel better?? Or maybe he just doesn’t cum a lot? But I don’t even really feel him tensing up or anything which usually I could feel with other men. I just hope he’s not lying every rime and saying he came lol. Sometimes he says he doesn’t know if he did or not and I’m like how do you not know??