You having to tiptoe around your long-distance girlfriend’s emotions isn’t healthy for you or for her. Limiting your social network and cutting back on seeing your friends because she shuts down will eventually create resentment in you. While it may not be done maliciously it is manipulative. The problems is you can’t be you in the relationship without it throwing her off. Over time this will put you in a terrible position because unless you make her emotional well-being your top priority in life she will have a reaction. This never works because you have to keep restricting yourself in the service of her depression, anxiety, and loneliness.
The work here is for you to help her understand she has to figure out how to cope with her reaction. You need to be very supportive of her struggle, but only by explaining that you are not going to not see your friends because it makes her upset. Move toward the conflict by encouraging her to think about what she can do to help herself. The key to this is to set a boundary about what it is you are willing to do for her, and with your help — help her find ways to take responsibility for her emotional well-being.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral