Guys, How to tell when a male friend is into you?

I (29 female) met this guy (26 male) at work a few months ago. We hang out with the same group of friends, we see each other regularly and he often texts me. I always had the feeling that he is totally into me and there is a flirty vibe between us.

However, another friend told me lately that this guy is bisexual, and I noticed that he actually has a lot of good girl friends he sees regularly.

So I was pretty sure that he was into me, but now I am doubtful. Maybe he just sees me as one of his girl friends and I am imagining things. Could you tell me some signs that a guy gives when he is into you?

Thanks

Guys, How to tell when a male friend is into you?
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