My ex 22F of 3 years got a boyfriend

I 22M Got out of a 3 year toxic relationship recently with my ex girlfriend 22F around the end of March this year, long story short she was talking to someone else and I found out so we stopped talking. But her and I would still send texts back and forth here and there and see eachother once in a while maybe once or twice a month. I still had super strong feelings for her but she would use me for attention. She would tell me she missed me and wanted to get back together and then ghost me, and me being dumb would let her back in everytime I missed her badly and unfortunately all the self work I was putting in wasn’t really helping with this situation. I still felt deep connection with her for months and months after and I watched her slowly fade out of my life. Now here and there she’ll text or call and I’ve seen her here and there but it’s no where near the same. So I’ve been getting a feeling something extra is at play. yesterday I woke up to dm from her I was pretty excited, she dm me at like 4 am so I was assuming she must’ve been thinking about it me lol regardless we have a little convo about something serious she has going on in her life and then sums it up with how now she has a boyfriend and it’s a different dude from the dude she was messing with before. I know I should’ve been long gone from this situation, but man does it really hurt knowing I truly lost her. She has someone she now calls her boyfriend. I am so sad, I tried so hard countless days and hours trying to get her back to show her I’m worthy and she would tell me she needs time and isn’t looking for a relationship rn. I’m sad as fuck lol. I know this will pass and hopefully I’ll look back on these times and think about them and be thankful but man I feel like I’ve been stabbed and split right open. Any advice?