Does it mean his gay when you find gay porn on your home computer?

About 8 years ago I found History on our home computer, the history showed loads of gay porn sites, sites on where to pick up Tweenks (I found out this means young gay men) and sites on glory holes. Since I know it was not me and the only other person at home was our 1 year old baby I assumed it was my husband. When I asked him about it he lied to me and some how tried to blame it on one of my ex-boyfriends (I know very strange) what is even stranger is I wanted to believe him. I had no doubt in my mind that it was him, I did not have a problem so much with the gay porn, I think most people have sexual fantasies that we would prefer not share with anyone, fantasies that would never act out in reality. But what I had a problem with is the fact he was lying and why he was lying. About 2 years ago we had a big fight and came out with "I know you think I am gay" I said "well I know for a fact you are a liar but whether your gay or not I am not sure". He then admitted because he had no choice but that he was interested briefly in gay sex but he is not anymore. My question is that possible? Is it possible for some one to be interested and now not anymore and does his sexual preference mean he might be bi? I don't know... For the longest time he would look for reasons to be angry with me to hate me, everything I said or did he would take the wrong way, he's better now but I still think about whether he would rather be with a man but feels he would be letting his mom, his friends, the world down if he was. Please let me know what you think.