I had a very good friend about 15 years ago. We met at work...I was covering some modules for her at the university and helped her with some writing she was doing. My husband helped her with some house issues. At the time, she was a lot wealthier than me, had a physician husband, posh house, holiday cottage, worked part time. My husband and I were renting, had just been married and I was working full time. I then got a more permanent job though was still in the area, and it was then she started ghosting me...there were three occasions she cancelled gatherings at the last second. So, I just stopped initiating to see what happened, and the friendship faded. Fair enough. Not everything lasts.
I moved out of the area. Now we are both of equal status as I got on and ended up having money, nice house, etc. I've retired, and she is now working full time. We've both been successful. By pure chance, I ran into her and had a cordial chat...she asked me for my personal email, so I gave it to her, and then just followed up via email and praised her sincerely for what she accomplished, said it was really nice to see her, and if she was in the area to come visit. (She had mentioned during our chat I should come to their holiday cottage sometime, which was nice). I also told her about an upcoming house move and some things I was doing in retirement.
I got a one line, polite answer, and my gut said...yeah, that is the last I'll hear from her. I still don't know what I did wrong. It shouldn't bother me, but it does. I just wish she would have told me what happened.