Broke up w girlfriend in July. Still love her and want her back, but had to cut her off. Confused about recent behavior?

ImNotCreativeEither
Trying to squeeze into 2k characters. Will answer questions for more detail.
I broke up with my girlfriend in July. We were together for about 3 years, but we met 2 years before we got together. We dated for 3 months before we decided to be friends. We were best friends for 2 years, but for much of it she was trying to turn it into more but iIt took me a while to realize I was in love with her.
Finally, 3 months after walking out of my life, she came back & asked again & I agreed. I had some things I had to work through & she agreed to stick by me. We had some missteps, but this didn’t seem like just one in a long line of relationships. This was it for both of us.
But there was friction in the last year. Her bro. created problems that culminated in a big fight. We came back from it but she said in some way she wasn’t as devoted to making it work as before.
The night she ended it, she said she still loved me & wanted me in her life as a friend. We agreed I’d still walk her dog once a week.
We chit chatted over text for a week until I said I wasn’t ready to give up on us, & she shut me down. After that, when she’d try to get some friendly banter going, I’d kind of blow her off.
She started doing weird things when I got there to walk the dog — claiming she forgot I was coming or “forgetting” to leave the door unlocked 3 or 4 weeks in a row. Then a few weeks ago she tried being overly friendly. She tried joking w/ me sometimes, seemingly hoping to break down the wall I’d put up b/w us.
She unfriended me in January, but never changed her relationship status. And apparently she didn’t change it even after that.
The other night she put a pic of her “boyfriend” on IG. Yesterday, she texts me about the dog, seems irritated, picks a fight, & tells me I can’t walk him anymore & blocks my number. Didn’t block me on FB/IG. My friend tells me she still hasn’t changed her relationship status even though she still posts. Nothing about a new boyfriend on FB.

What’s she thinking?
Broke up w girlfriend in July. Still love her and want her back, but had to cut her off. Confused about recent behavior?
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