Health issue or masturbaring too much?

I’ve been with my bf for 6 years now, our sex has always been fine/average. (We were both virgins when we got together). I’m able to have a orgasm while he’s in me(in the beginning I wasn’t able to but now I can). The past couple of months I noticed when he’s in me(I’m already satisfied at that point) he can’t finished, he needs to get out, masturbate while he looks at a body part of mine. Back then he was able to finished when he was in me but now a days he can’t. I’m wondering if it’s a health issue or he masturbate too much(I was messing with his tablet when I came over some pictures, he has a lot of those close up images of girls/body parts). I know everyone watches porn and masturbates but im wondering if he’s over doing it? We try stuff that he likes but I feel these ideas are from what he sees(porn).He claims it’s the condom or not trying different position(that he’s not able to have his orgasm). We do try different positions (what I can handle) Im willing to try more different positions if that’s the case. We tried with out a condom and he wasn’t able to finished in me(he had to get out of me and masturbate). I sometimes wonder if I’m the problem. Any advice?