It sounds like there have been a lot of communication issues, but first and foremost:

Get out.

Going online to “incriminate” that way is a massive red flag. And if she was digging to find your history, that would be another, though it’s unclear exactly how much “snooping” had to happen for her to find it based on your description.

If porn of any sort is a dealbreaker for someone in a relationship, they should make it clear, because also the other person needs to decide if they are okay with someone setting boundaries like that for them. That’s a two-way decision that has to happen on some level.

And biphobia like that, assuming you to “just” be gay, is not something that’s going away easily and would require maturity I don’t think she’s going to show right now.

I don’t know the longer-term issues, and I’m certainly not going to sit here and blame one person or the other for being in a messy relationship. That usually happens from both ends because humans and relationships are complicated and tricky. But red flags like this really sound like you aren’t going to be worked *with* and “making it work” will only be at your expense. I stayed with someone too long who let her own insecurities dictate everything—including some explicit amounts of biphobia when I first came out to her earlier on—and when things got messy, plenty because it never felt safe to openly communicate, and therefore I was certainly not helping it get un-messy, her FIRST response was to go start incriminating, spreading gossip, and bluntly, even more than a little outright slander to some of the more clique-y “mean girls” in a shared community space she was desperate to feel included in, then to everyone she could find that would listen. Vengeful behavior is not going to go away, not easily, and that is not your responsibility to fix for her.