Is my boyfriend not attracted to me?

So my boyfriend is deployed and we’ve started having FaceTime sex to keep it spicy. It’s been going very well but the other day when he asked if I wanted to do it he had set his phone down under a metal thingy where he didn’t know I could see the reflection of what he had pulled up on his phone. I was already undressed and ready to go and I watched him go into his camera roll and pull up a video of another girl masturbating. He wasn’t even planning on looking at me during FaceTime sex. I don’t care if he watches porn but I am hurt that during a time where he was supposed to be focused on me he was looking at another girl. There’s no point in having FaceTime sex if he’s going to do that. I told him I was upset and asked why he did that, to which he replied “I honestly don’t know, I have no explanation for that.” Is he maybe not attracted to me? Has anyone else ever experienced this before? Any insight would be appreciated. Sorry about the long read. Thank you :)