Be cautious of the language you choose to use, which can become unhelpful instructions to yourself. Don't tell yourself that you cannot keep a friendship, but that you haven't managed to do so, thus far.
Sometimes your sort of experiences mean one lacks some social skills on can learn from a counsellor, and sometimes it's that one comes to try a bit too hard, which can worry other people. If you have recently become engaged, doesn't this mean that you have managed to form one rather special friendship, with your fiancee ?
The best course of action would b to see a good local psychologist or rgistred counsellor, to explore this problem : how it arose, how it has affected you, and how this can be changed for the better, as I'm sure it can.
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