(Sorry in advance for the long post)

Back in Jan when my boyfriend and I broke up for a week I cut his phone off. I took his old phone to cricket when I was getting his new phone turned on. When I got home I looked through his old phone and found 2 porn videos of tranny porn. When I asked about it he said his weird friend sent them to him earlier that day and he didn't get a chance to delete them (which this particular friend does send weird shit to everyone). So I was like okay and moved on.

Over the past couple of months I noticed anytime he told me the passcode on his phone it would be different the next time I tried to get into his phone. So I thought he was talking to another girl or something and a couple weeks ago I confronted him about it. He told me that it's because he watches porn on his phone and he gets weird about it because his ex-wife would get angry about him watching porn. I told him I didn't care and that was it. So he hasn't changed his passcode since. He told me that the porn I found in Jan was actually his and he was embarrassed that I found it. So I'm like well sometimes people get curious or whatever and didn't make a big deal out of it.

So the past couple of weeks I would find regular porn and sometimes tranny porn on his phone. I looked last night and it's flat out gay porn on his phone along with a tranny video. And I noticed the past couple of weeks most of the videos would be tranny porn and maybe like 1 or 2 regular porn videos. So now I'm feeling weird and kind of uncomfortable with him watching it. He told me when he first admitted to watching it that he's not gay, he loves and wants to be with me, but he thinks it has something to do with what happened to him (he's been a victim of male rape twice), but I don't know what to think. I know he's grown so I can't force him to stop watching it, but now it's making me feel weird.

Side Note: Back in the summer of 2015 he had a sexual encounter with another man and told me that he flat out doesn't like other men. I figured at least the tranny videos look like a man and a woman having sex (until you see the private parts) because they have makeup, long hair, and breasts and stuff. I honestly thought it was a temporary thing which is why I said it was ok, but it's been months now.

So now I'm wondering if that's what he wants without even realizing it or something. It's starting to fuck with my head. Now I'm wondering if he's thinking about that when we have sex or something. You know fantasizing about it or anything.

My sister says I should just leave it be because confronting him might make him close himself off to me (since I already told him I'm okay with it), but part of me is bothered by how often he watches it. What should I do?