I really need some outside advice

So I've been together with my boyfriend for about 8 months now. In the beginning he used to be more spontaneous and the sex was fun.

But now, things are different. He barely wants sex, if anything all he does is ask for head or have me go on top.

I did however find out that he definitely bisexual, and is into trannies and men. I honestly don't have an issue with that.

The only thing that's getting to me is,

1: I've caught him messaging tryannies and men for sex. (I'm still not sure if he has actually gone through with the deed).

2: He doesn't want to have sex as often, and I keep finding trans porn on his phone.

I really wish that I hadn't, but one night he said he was too tired for sex. The next morning when he was going to shower, I looked under the door and I can tell he was jerking off.. and I'm pretty sure it's trans porn again.

I've been experimental and had pegged him before. I'm really not into anal and he keeps asking.

I don't doubt that he loves me, but I'm starting to feel that I'm not meeting up to his fantasies. And I don't want to force myself to.

I've already confronted my boyfriend by saying that I know he is Bisexual. But I guess it's me either having to accept what it is or to leave him.

It's really hard cause I have feelings and now I feel like a fool. Cause I've helped him so much. And that would be more details to add. But i don't want to write that much. To say the least, I've looked out for him like no one else had. Not even his own parents.

Idk, tell me what you think.

He's actively trying to cheat on you. Him being bisexual doesn't mean he will naturally try and hook up with other people while you are together.

Better feel like a fool now but see the problem rather than allowing yourself to be in a miserable relationship.

Porn is porn. But messaging other people for sex?! Doesn't matter what sexual preference he may have, infidelity is a big no no!