This is a hard one. People pretty much can tell if a guy is gay, but not if he is bisexual... so what do you think would be signs of a guy that likes both sexes?
Also, if you find out that your guy is in fact attracted to men, what would you do honestly?
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I think that true attraction would be pretty obvious to notice. Otherwise, there aren't really any reliable signs, from what I've read. More people seem to be bi-curious than actually bisexual. It probably has to do with the difference between emotional attraction (which would be considered bisexual) and physical attraction (which could be bisexual or bi-curious behavior).
The only way to know for sure is to talk with the guy. Chances are good that if he is bi-something, he won't tell you the truth for a long time. There's almost as much stigma attached with being bisexual as being gay (or even more, in the case of men).
That's my guess, anyway.1