<human>: Basically, I've got a typical high school crush on a guy for the first time since high school. I was in one relationship (serious and long-term) and that was initiated by my now-ex. I've been approached, but the last time I told someone I liked them was in kindergarten.

I'm friends with him, but not very close. My interest is fairly recent. I'm very introverted and I have very few friends, just because it's hard for me to warm to new people. This brings up the typical issues of, one, not wanting to lose him as a friend and, two, not making things awkward in our friend group. 

We're both the same year in college, by the way. If this is relevant, I'm also openly bi, which I think might make some people assume that I'm actually a lesbian.

The other thing is, I don't know the first thing about his dating interests or history. I think he's straight, but I don't even know for sure if that's true (not because he's effeminate, just because it's a silly thing to assume with absolutely no reason).

He asked me to hang out with him several times and we've spent a few times just me and him watching movies or shows or just browsing Reddit. The problem is, I don't know if this is because he has very few friends as well or not. It could very reasonably be totally innocent, especially if he thinks I'm a lesbian. 

The first thing would be to determine whether he's actually interested in dating and, specifically, interested in dating women. How do I do that tactfully? How likely is it that you guys would assume a girl would be uninterested because she said she was bi? Finally, how do I go about showing my interest? How is best for a female friend to get a guy's attention without hinting around as girls tend to do?

Can you give me the gist of the text in a nutshell?
<bot>: interested in a guy, mostly sure he's straight, not sure if he knows I'm half-straight, what steps do I take to tap dat?