I caught my boyfriend looking at gay porn?

I caught my boyfriend looking at gay porn?
I'm involved in a serious relationship with my boyfriend for a year now.A few months back I saw in his computers history that he was looking at homosexual porn..welll..that..plus girls..then some transvestites..then some some boys...then some girls peeing on guys..weird stuff..
I was very very confused on whether he was gay or not!After recieving advice from others I decided to stay with him a little longer to see if his curiosity would continue or if it was just a one time thing.
It wasn't!He still looks at it.It's now a mixture of transvestites...men on men action and girls with huge breasts..I check every once in a while and he does it pretty much whenver I'm not around.
-Does it mean he wants to be with a man?
-Is he confused?
-Is he bi?
-Will he experiment in the future even if we were to last?
-Is he satisfying his sexual urges before/after I get there/leave because I can't satisfy him sexually?