My boss and I have a messy relationship and I don't know if I'm misreading her or not. Looking for advice or insight?

To nip it in the bud, no I do not mean a romantic relationship, just our relationship as people. I'll refer to her as F for short.

When F first came to our store we hit it off straight away. We had similar interests, senses of humor, we would burst out laughing at the stupidest things. We got along so well at work. 6 months later I found out F was actually a manager in training and was going to be my direct boss. I had no problems with that because F was tremendous in everything she did and I truly admired everything F did especially with how much scrutiny she got from others. F confided a lot in me, and even after officially being promoted we still got along like normal.

4 months in things changed abruptly though. F stopped engaging me the way she used to, becoming very blunt and impersonable. F didn't come talk to me anymore, including work. All of our normal was put on hold. We went radio silent for awhile and I thought that with the holidays approaching maybe F was just under a lot of stress, but she was still acting normally towards the rest of our coworkers, so this was the beginning of me thinking that there was a problem between F and I.

F continued this way until Christmas, and I was hoping that after the holidays F and I would go back to getting along, but instead F started getting inconsistent. Sometimes F would continue being the way she was during the holidays, sometimes F would talk to me as if nothing happened, but she added in new reactions such as getting mad, annoyed, or even upset towards me when I tried to talk to her. F also on a few occasions told me she missed our banter and jokes and told me to come talk to her, but when I did she was meek, didn't laugh or smile, and wasn't making eye contact. I've bluntly asked her if she had personal issues with me to which she tells me no, and this is where we are to this day.

I've been trying to keep my chin up, but I'm worried that our working relationship is troubled and I don't know what to do.
My boss and I have a messy relationship and I don't know if I'm misreading her or not. Looking for advice or insight?
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