A little uncomfortable, sure. I'd say that's natural. But if you dork out and get too jealous and shit, don't be surprised if she blows you off for hottieboy Mike. Fine line you're walkin' there -- if you don't care enough, she'll think you're not as 'into her' as you used to be. If you get too concerned about it, you're a jealous prick.
I'd say just be confident in your relationship and trust her. After 2 years, sounds like the relationship is worth it. I mean, just 'cuz she's around this cute guy doesn't mean she (or he) is going to do anything about it... have some confidence that she's been with you this long for a reason and show some faith in her.
... but if she comes home sloppy drunk with her hair tassled about and reaking of sex after a night out "drinking with folks from work", disregard everything I said...
<br>