its been months since the breakup yet i still have attachment (any advice?)

my partner broke up with me for some unknown reason, i'm convinced that we didn't really have big problems that would lead to a breakup, so on my end it really was out of the blue. if any it could be resolved through communication, where they kept on avoiding to talk (do you think theyre guilty of something?)

months passed full of unanswered questions, why did it happen, how did we come to this. to this day i don't have answers. and it's honestly been hard moving on. after 5 months or so, I finally had a grip of myself where I'm able to not sulk anymore. I'm also convinced that I have "moved on" yet I still think about them

a lot of self reflections really, since i was left figuring things out on my own. i miss a version of them that isn't here anymore but I just can't accept that since technically they are still alive but they're just not here for me anymore.

it still hurts when i think about it, before we were partners, we were long friends, close friends even. so im still longing for both ends, a friend, and a partner at the same time. what bothers me the most is that, they seem to be fine without me, I know that, that says a lot already but how could I accept that? - they just threw what we had under the bus and left me (i can't help but to feel used). i at least deserve a proper talk or a sorry, it's not like I did something bad to them but the case is they avoid me as much as possible (even talking about me through our mutuals)

conflicted about how should i feel, i'm mad, sad, but at the same time i would drop everything for them if they wanted to talk to me and would still give them a chance (but the thought of instability with how they handle the relationship back then makes me doubt the person that they are today)