Girlfriend is studying abroad?

[Brendan]

A little background- me and my girlfriend have been going out for 4 years, we have a great relationship, her family loves me, etc. She just left about a week ago to study abroad in Istanbul and London, and while I support her getting that experience, and learning about different cultures, I don't know how I feel about her having unbridled freedom in a foreign country with a mixed group of guys and girls. She has been texting me sporadically throughout her time there, and we talked on the phone once for 5 minutes. I'm really not a jealous type of person, but this is a pretty extreme situation. I also noticed via her facebook that she spends a lot of time with this one other girl and 3 guys- also the girl and two of the guys went out for drinks on her second night there. She also has seemed a little distant since she went over- My question is I am over reacting, or do I have a legitimate reason to worry?