Say whuuuuut, surely just being in a relationship with someone is what you're aiming for there?
Anyway, back to business - i think it's natural for anyone to be a bit wtf about your missus getting overly matey with lads (speaking from experience i definitely should've given more of a shit about my ex doing that) but it's all relative. It does no-one any good to get so worked up over it, and if you actually trust her then you really shouldn't be worrying. I genuinely couldn't give less of a shit who Faye sees and when as we both know where we stand with regards to each other.
If you have a decent/ attractive girlfriend, people will always try it on from time to time. Guys see hot girls and want to dick them, it's the way the world works. It's just how you handle it that matters. She'll not take notice or tell them the score, and if they try it past a point, cross a line or try it when you're there then you can be a little more hands on which is great fun. Girls dig cavemen.
If it seems like she's coming on to them though, you've got some serious issues - but without us knowing the full story and what you're shitting yourself over when it comes to what she's saying/ doing we can all only speak hypothetically about it and give some very general advice, as opposed to something aimed squarely at your situation.
Anyway, it's dinner time.