AITA for moving out of my bsf’s house without a word and into an apartment with someone she matched with on Tinder

My bsf-19F and I-19F started using Tinder at the same time. As you can imagine we matched with the same people a couple of times. This time I was a day away from going on a date with my now boyfriend and we learned that we had both matched with him. She had previously canceled on a date with him to go out with someone else bcs the connection just wasn’t there. We agreed that it was all good and my date went great! I became his girlfriend after about a month but she was still going on dates. Part of me feels like she was jealous that I had this wonderful relationship with someone that she almost went out with, even though my boyfriend has expressed that he wasn’t ever really interested in her personality. It got so bad that at one point we had a brief argument about her bringing guys over after first dates and if I should know who they were. She claimed that I never wanted her to be happy and that she was going to get into a relationship even if it was fake bcs she wanted what I had. Eventually she got into a relationship and became very distant. She had always said that girls who ditch their friends for guys sucked, yet he became her whole life and she shut everyone else out. After about 10mo of being with my boyfriend, we moved into an apartment together. The day I moved my bsf was going on a trip with her boyfriend. She left as I was packing my car and said nothing. Even after we were moved in there was silence. I didn’t text her bcs the last time she went on a trip with her bf she was snappy and rude when I texted her so I figured I would leave her alone. A couple weeks later I asked if she could watch my cat while I went to another state and she replied with no and a fake reason as to why. I knew it was fake bcs I still had friends back in my hometown that worked with her. Apparently she made a big fuss about how I was the one who ditched people for my boyfriend and that she wasn’t going to watch my cat bcs of that. Mind you I had this cat while I lived with her and they were besties, it was just an act of pettiness at that point. It’s been 4mo and I still haven’t heard anything, only getting the occasional drama leak from my friends. AITA for not saying anything after I moved? Or was she too blind sighted to see that she had lost her friends due to her own hypocrisy? EDIT: Just to clear up some confusion. We were both living with her mom-me for two years atp- and they knew I was moving out for awhile. Her mom’s new hubby even encouraging both of us to. I told her to have a good trip as I packed my car and didn’t hear anything since. I had hoped that asking about the cat would spark conversation after the week and half-ish that we hadn’t talked.