Is this a thing? What could be the problem?

This guy I hooked up with about 3 times now said he only finished once. (I have the implant so he just cums inside me) why would he keep coming back for more if he isn’t finishing? How can I get him to finish? Iv asked him and he says idk 🙄🙄🙄🙄 he said it’s an issue he has and it’s not just me it’s that he lasts too long and then gets tired. Iv never heard of that before! What is up with this guy? Helppp

Edit: I don’t “have an issue with it” I just want to pleasure him. Thanks tho 😅