A couple of years ago a work colleague who I've vaguely know for a few years actively sought me about as a friend, inviting me for coffee and to social events, sharing personal information with me, generally making me feel special. I'm quite shy and introvert and am happy doing my own thing so the 'special' friendship she created was something I hadn't experienced since my 20s. Then after we had spent a few months being good friends she started to back off, didn't want to meet up outside work, stopped confiding information etc. As far as I'm aware I never did anything to offend her, apart possibly from challenging her when she decided we weren't friends anymore
My problem is i still see her at work and sometimes i really resent her for sucking me into what i thought was a good friendship and then dropping me when it suited her. Although I try to remain calm and pleasant to her, i find myself getting defensive and easily annoyed with her. I've tried to have a clearing the air conversation but she won't engage in it. I need some calming, 'zen' advice on how to just let this go and move on gracefully.