A few months ago, I found out that my boyfriend of 3 years is bisexual. He had started watching gay porn, going on gay sites, signing up.. etc. I talked to him, freaked out, and he admit it to me, but told me that he was confused because he's always been a homophobic, and he didn't want to talk to me about it. I decided to look above, and were still together. He still watches gay porn, and it shouldn't bother me because at times we watch it together, because I only like watching gay porn! Its hotter and it turns me on. The problem is, I'm scared that he will need to have his first experience. He tells me that whatever happens, he'll never keep anything from me agan.. but, I'm scared. I don't even know what my question is, but is it risky to be in this relationship? He loves me and I know it. He's very attracted to me sexually.. he wants sex often. I'm just having trouble trusting him again and I'm scared that he still talks to other guys online.. I'm so confused.

So ? If he was straight, he could always cheat, watch regular porn and chat with girls online.
Cheating is cheating.

If you don't trust him, it has nothing to do with being bi, it has to do with his morals on cheating.

I have to agree that if you are worried about him cheating, this has nothing to do with being bisexual.

What you should do is encourage him to talk with you about his feelings and interests. This means that you need be open to him being honest with you, and not chastise or belittle him. You also need to be careful not to be angry or judgemental when he is honest with you. This will shut down honesty VERY fast.

He has a right to explore all of himself, as you do. How you both do that within your relationship will greatly depend on the willingness of each of you communicate openly and honestly with one another. Trust is not inherent, it is earned.