Is there something wrong with me?

I know that sounds ridiculous. He says it’s ridiculous. I know it’s is. I’m having a hard time believing him lately. We went 7 times having sex without him getting off; Then 3, then 6, now we’re at 8. I think it’s the new meds they have him on for ptsd but it’s not that he has no sex drive. We’ve been having sex 3 times a day, he’s just not getting off. Majority of the time he stays erect. I have been trying everything I can think of including role play, dress up, tying myself up (cuz he won’t do it). I’m at a loss. Any advice??