Chatzi I get the impression that the situation and circumstances with your long-distance friend are simply evoking more deeply-embedded emotions from your past and touching upon sensitivities/insecurities that would have been present before you even developed a relationship with this person. Sometimes 'life' (or you could say the Universe) has a way of placing us in situations/circumstances that ultimately end up showing us what is still unresolved (unprocessed) within us and what still needs to be brought to the light of day and healed (purified)...

If this rings true, that your interactions with this long-distance friend are serving to evoke more deeply rooted emotions and feelings which extend beyond her involvement in your life - then increasingly integrating this awareness into your current conscious state will serve to necessarily shift your focus & attention inwardly (where it needs to be) and will simultaneously serve to make the present surface-level external circumstances (involving this individual) seem less threatening to you... Be patient with yourself and allow yourself the necessary time to process these challenging emotions that have surfaced... In the end you'll be thankful that you navigated your way through this time in your life... Why? Because it will have changed and refined you - for the better...