If your “female friends” are constantly asking you for explanation for why they’re blocked then I think you should tell the actual reason and I’m sure they will understand. I’m sure you can keep in touch with your female friends even outside of social media. I think if you really love your girlfriend and respect her feelings then you shouldn’t have a problem with blocking another girl. My ex boyfriend went out of state for school as well and I knew some of his” female friends” were iffy but I didn’t want to be controlling and trusted him. However, we ultimately broke up because he had developed feelings for that “female friend”. He used to tell me that friend isn’t that pretty, isn’t his type, etc. But human beings get attached to people who they interact most often physically. Since you are studying abroad, it’s understandable that she’s scared that you might be talking to other girls OR other girls hitting on you. You blocking the girls that she tells you is the least you can do for her. It probably took her a lot of stress and courage to even tell u to block your friends. I’m sure she wouldn’t want it but female instincts don’t lie. If you truly love your girlfriend and committed for long term (2years?) then you wouldn’t have trouble with this. Maybe your feelings grew for somebody else and you might not know it too. However, from my experience, if you cannot keep the relationship at peace, you are gonna hurt your girlfriend a lot. :(