I'm hopeless at telling if a guy likes me, having hornbags as friends has left me with the impression that most guys would fuck any woman they can, so how are you supposed to know if someone is talking to you puerly cos they want to get laid or besause they like you (and want to get laid)?
Ha! There is probably some truth in that.
I think if you spot a gentleness in a blokes attitude, along with/rather than the usual full on direct flirting/ slagging, then thats a sign. Also, if they talk with you rather than at you. If they genuinely like you, then there is probably a bit of nervousness there too. All of which would probably destroy the poor bloke's chances of getting anywhere with you.
Its a...