Ok gays, here's where a semi-straight woman's point of view comes in handy. I've noticed some of my gay guy friends, especially the ones who are not "players", have an even harder time reading men's signals than my average girlfriends do, and I thought they were clueless. I always chalked it up to women who grew up without brothers, which I had two, and I feel like I have some insight into men because of it, and also having had relationships myself and nursed many, many girlfriends through probably hundreds of relationships with men.
But I recently watched a whole homo relationship pan out from beginning to end, as I am friends with both guys. The one guy, let's call him Friend A, was absolutely, positively clueless about the unspoken, unwritten signals my other male friend, let's call him Friend B, was sending. It was weird to me, because I felt like the way Friend B was acting was like "Guy 101." Not calling or answering texts, only wanting some when he was drunk, never giving any sign that he was into friend A.
Friend B is a very masculine, straight acting dude, and is in fact the only gay redneck I've ever met, and he acts just like your typical straight male, excepts he lives for cock. Friend A acts more bottomy and likes Madonna and Lady Gaga, while friend B would rather shoot himself or someone else in the head than listen to pop music. Friend B hooked up a few times with Friend A, and Friend A was practically filling out the wedding registry at the local department store, while Friend B barely thought twice about the encounter.
I didn't step in to offer any advice to Friend A because I thought, surely, friend A will know that friend B is looking at this as a booty call, and nothing more. But then I realized, I take for granted things that girls/women learn about the ways of males from teen years, while gay guys have to generally wait a while to get out into the dating world.
This is why I think banishing straight women from DL really does you all a disservice. We know one thing, dick, and that's something we all have in common.
Anyway, bottom line, if a man is interested in you, you will know. Period, end of story, no equivocation. If he is not into you, he will not pursue you. Easy as that. When it's two men, same thing. If that guy had been interested, OP, he would have made sure you had his number. Sorry to tell you that, but it's better to find out right off the bat than to hold out hope. The book "He's Just Not That Into You," pretty much nailed it. Men are the easiest creatures in the world to read, they say what they mean, and mean what they say. I watched my brothers my whole life and dated and fucked many a guy, and that is a general law of the y chromosome that holds true whether you like a dick up your ass or not.