In your opinion, does he like me?

My best friend's cousin hasbeen texting me all summer. He's in fourth year of the program I am entering next month. (or is it third?)

It started out just talking about school, but now we talk about everything. We've discussed where we want to travel, what we want to do in the future, our hobbies, just whatever is on our minds.

Example of conversation (from tonight):

Brandon: Are you writing any stories?

Me: Yeah, a couple. I haven't had the patience lately, but I want to get back into it.

B: what genre do you like to write?

Me: Romance. haha. I'm definitely a romantic.

B: hahaha, steamy ones? Or pg 13 ones? lol

Me: Depends x) some of my characters are innocent, some are pretty um...r rated

B: sounds like I need to get ahold of one of these stories!!!! hahaha

He's usually the one to text me first, usually about something school related. Like, he will tell me book lists are available or something, but then we end up talking all day.

He's a really nice guy and I like talking to him. The thing is, I'm about 80% sure I'm gay.

Do you think he likes me?

I tried talking to my best friend about it, but she just gave me a look.

And if he does like me, do I tell him I'm gay so he doesn't get his hopes up?
Or should I just go along with it? I mean, I'm still technically questioning whether I'm gay. I could be bi.

OR I could just leave things the way they are. If he asks me out, I could just go with the flow as I am feeling at the time. If he doesn't, no harm done.

Opinions? Advice?