u/Alone-Sorbet-4797

Hi so this all happened like literally an hour ago. This is going to get personal but who cares. So my boyfriend (20m) and I (19f) were having sex. We had just taken a bit of a break to switch positions and he had gotten a bit soft. I was facing away from him but on top of him (reverse cowgirl) and he said he was just gonna get it hard real quick so he went to jerk off for a second while I still had my back towards him. While he was trying to get hard he came and so when I turned around I saw he had his phone out. I snatched it from him and saw he was on pornhub watching another girl get fucked while I was right there naked in front of him. Also another thing is that him finishing with me has been an ongoing problem. He has never been able to finish by me doing anything to him and it’s always been him having to jerk himself off until he finishes. Do I break up with him? This feels like cheating.
TL;DR my bf started watching porn while we were having sex and tried to hide it from me