The basics - I have a very close male friend. 17 years younger than me. He has a girlfriend, I am single. I have always seen him as just as friend, not exactly like a son/brother but you get the drift. We go to university together - are in the same very small tutorial group and we also play sports and go to the gym together. But outside school we don't see each other, though we are both bad insommniacs so sometimes chat on FB to 3 or 4am.
Anyway, he is in his 1st real relationship but the girl is a bit intense - just young but he can't talk to her at all about how he feels or who he is, and he is a very deep, sensitive person. For example he tells her he feels depressed - she is upset and makes a big scene that he doesn't love her or he would be happy all of the time. So he talks to me instead. We have both had pretty tough childhoods and suffered from depression, so we can really understand each other and I value his friendship a lot. I try to be like a good older sister to him - encourage him that his girlfriend is young and she doesn't have the experience to understand, that in time they will hopefully become best friends not just lovers etc etc. They only see each other every 3-4 weeks as they live in different countries.
Anyway, I had a quite a bad accident recently and me told his girlfriend about me. How he was worried about me, that he could talk to me etc. This caused a very large argument. I never noticed before but I think he has a bit of a crush on me. I look about 10 years younger than I am and I don't think he knows how old I actually am. I feel really bad that he is fighting with his girlfriend because of me. I want to be his friend, but if he does have a crush on me I think I should start to disengage a bit. However we have very tough exams coming up - I will miss him hugely and I think he would miss me too. I am a stright A scholarship student, he is very bright but does not do so well in exams (has depression) and misses a lot of classes - but tends to come with me to class when I bully him to.
So should I disengage - leave him to his own devices? Or just keep things the way they are and maybe disengage a bit once the exams are over? This is 100% a platonic friendship but I care a lot for him and just don't know what is for the best :(