I sincerely wish my crush was straight....

I (17) have a crush on this dude (19) and he knows it. At first I thought he was straight but later a friend told me it's an open secret he's bisexual. He's in the glass closet. So I thought I could maybe... put some effort into making him like me. If he was a straight dude I would have probably moved on after a few weeks or so.

Anyways I slept and still sleep with him regularly. When he compliments me I get all bubbly and stuff but he doesn't actually want to be with me and it makes me frustrated and causes me a lot of pain. One day he likes me and one day he doesn't. He wants me but pushes me away. I don't know is he a bisexual hetero romantic? I don't just want sex I want a relationship and I thought if I sleep with him he's gonna like me but now that I have had sex with him I like him even more romantically.

My God why couldn't he just have been straight I would have moved on by now.