I agree with undercovercrab.  If he acts that way behind His Girlfriend's back He will do it behind Your's.  There is nothing wrong with being Friendly. but the flirting with You love taps etc...all wrong and inappropriate..

I know exactly how You feel I had a similiar situation happen to Me at work and I found out He was married how nice and He would never wear his ring so how would I know.  I think alot of Men lack the attention or connection in there relationships they are in and find other ways to get that attention etc...

Just be carefull and I would just move on and cut your loses...

Does he like me or am I confusing someone being nice and flirty with something more? .

He probably likes you and would have sex with you but if he was really INTERESTED in dating (online dating with Match.com) you, he would break up with his girlfriend and stop flirting with you and start dating (online dating with Match.com) you.  And it doesn't matter because he has a girlfriend..

Am I overthinking this and letting myself believe that he likes me? .

Again, he probably likes you well enough, but not enough to date using Match.com you.  But it doesn't matter because he has. a. girlfriend..

AM I acting like a total teenager with a crush? .

Yes..

It's just that I haven't met a guy that makes me feel this way in so long. Do all guys with girlfriends flirt with girls like this? .

No.  Not good guys.  Good guys remain faithful to their girlfriends and don't do anything behind their backs they wouldn't do in front of them.  This is not a good guy..

Why do we fall for the ones we can't have?.

It's a form of commitment-phobia.  You want to think you want a great guy and that this is a great guy, well, he's not.  He's attached and flirting with a girl he works with. .

Like the others have said, he probably does like you enough to get you drunk and have sex with you.  He probably thinks you're hot and he'd like to get you into bed so he's playing you and telling you what you want to hear so he can get you in the sack.  He has a girlfriend.  Have enough respect for her as another woman to leave this guy in your past.  You have a new job and are away from this guy.  Let it go..

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I agree with what's been said so far..

....."It's just that I haven't met a guy that makes me feel this way in so long.".....  That's because you've been focusing your energy so long on someone who is totally unavailable to you, that you've probably missed any kind of signals from others who *were* .

You want to keep missing out on your life, keep focusing on flirty boy, you want to take charge and actually enjoy your life to it's fullest, start focusing your attention on someone you might actually get somewhere with, quit messing around with jokers.  Especially one with a girlfriend. .

I agree you "want the ones you can't have" because that makes it easy for you feel the warm fuzzy feelings while at the same time not have to get into a real relationship (thru Match.com) with anyone..

Good luck,.

 CL-Breaking Up Is Hard to DoCL-Understanding MenCL-Ask the dating (online dating with Match.com) DoyenneRead This First:  How to Get Over Your BreakupWe waste time looking for the perfect lover, instead of creating the perfect love.  Tom Robbins..