Self-esteem issies & p*rn

Guys my boyfriend watches porn quite frequently even if I'm home anf sitting next to him, he'll go tot he bathroom. At first it didn't bug me but it became an everyday thing im sure maybe more than once a day sometimes so i tried talking to him about it because it started to make me feel very bad about myself. We got into a huge fight because of it, I was trying to talk to him like a normal conversation bit he got mad saying it was stress relief and normal and he said it helps him last longer? But last time we had sex i couldn't get him to cum and that made me feel even worse. Now that the fights over with he said he'd stop but I can't get over this terrible feeling about my body I hate looking in the mirror