Condoms keep falling off...

Okay so one time it got completely stuck in me and then I keep noticing that after were done when he pulls out his dick comes out then the condom kinda gets stuck in me and he pulls the tip part out real quick and I'm just like 🤔 he likes to come then keep going for me cause he feels ashamed he doesn't last long (even though I told him it's ok...) and I think hes average size hes long but slim and idk I'm just wondering is this normal cause my ex the condom was like skin tight on him to the point where it would break if we went too rough and now with this guy it seems too loose I'm just like

Is it me or the condom or I don't even care that much cause I have nexplanon but I was just curious