Navy man's GF fooling around? I'm overseas

A little background, I'm active duty U.S. Navy enlisted, a Sailor. I'm overseas, and I have a girlfriend (over a year long relationship) who I suspect may be fooling around with an Airman who lives back in our hometown. I just want an unbiased opinion here, tell me if I'm crazy or just looking for an excuse to want to believe she is being faithful. - -Tell me if this sounds weird: 1. she says she's gonna hang out with some air force friends, i say I'm not really comfortable with that because, let's face it, young single military guys are hound dogs. she says she won't, then she does anyway and tells me the next day 2. She went to a city in texas an hour or so from our home town on the 4th of july and stayed in a hotel for two days with that guy jonathan and her friend sydni, she says she slept next to her friend sydni. I flipped my shit and told her that's not ok cause how am i supposed to know, and if i did that with some girl she'd freak out too. 3. She goes out and ignores me every night almost, and when I post lovey dovey bullshit on her facebook she always deletes it. I asked her about it she says, i delete all kinds of things, it's no big deal, i say that's bs cause it's the only thing she deleted. she says whatever i'll probably delete my facebook anyway. Jonathan Nagel, some Airman she's been hanging out with for the last 3 weeks What do you think, am I crazy or is all this a little sketch? When I first asked her who these airmen friends are she says, oh idk their names, i'm friends with their gfs. That was a lie that i brought up right away, cause she had added Jonathan on FB a few days before she went to this fly boy party. So I asked about Airman Nagel and she says oh no he added me, i don't know him. A week and a half or so later she's staying in a hotel with him on LSD for two nights, and her female friend who she claims to have bunked with... which I even let that slide really Sorry, I just need an unbiased opinion

P.S. it should be noted that I'm 22 and she's 21, we are still young and we both do go out and party.