confused... found old emails on boyfriends phone?

I was going through his email because I was applying for jobs for him. I looked in the sent folder and 2 years prior before he met me, he was on craistlist asking a bunch of random strangers for a blow job and that he's bi-curious. I had also found a gay pornsite hidden under his saved references in safari. He swears up and down he loves women and that he's straight. Awhile back he was telling me he rented a room with a friend a few years back and they had sex with a prostitute, I laughed in his face... he said he wasn't kidding. I got butthurt and he's like believe what you want. He keeps saying yes and no to this story. As for having a long history with women, we made a collage of his ex girlfriends. His Facebook messages prove he hardly knew half of them. When his sister was having a wedding, he sent a mass message to some   of his "former" gals saying," hey I don't really know you that well but do you wanna be a date to my sisters wedding?" Which leads me to believe he's been lying about his past? his sisters always comment or question whether he's gay or not. I usually tell then to shut their mouths cause it's never good to harass anyone. His youngest sister said, I am being used for a cover up cause he's a closet gay. She pissed me off. She uses the word "fag" to make him angry. I don't know, I haven't talked to him about what I had found. I don't want to upset him. Plus I know that he loves me dearly, he puts up with my ass everyday and cuddles me at night before he falls asleep. I love everything that he is, I don't care what his sisters say.... doesn't make me love him any less.