On second thoughts, I think if he was gay/bi then he would have very valid reasons to stay in the closet.
He starred in The Bachelor and who knows he may have to affirm his sexuality with the casting directors before the show was created. He also had a significant female audience after the show, and some of them may be disappointed if they knew he wasn't straight.
Essentially, he may not want to come out as the biggest liar and a gay dude who happened to be the main actor on an ironically straightest show ever on TV.
So, we shouldn't expect him to come out anytime soon even if he wasn't straight.