would it be bad to reach out to a mutual friend of ours even if she probably doesn’t remember us?

TLDR; i’m in no contact with my ex. i had a friend before i met my ex i used to vent to but it’s been 3 years since we last talked and she was also friends with my ex before i even met him. would it be weird or bad for me to start talking to her before if we used to support each other and vent together? or would it just keep me trapped in place if i talk to her while i’m trying to move on?

so hi. recently i (f22) broke up with my ex bf (m22) after a long battle with trust issues and ROCD issues on my part. we met four years ago and we’ve been best friends most of that time. we had a few periods where we would ghost each other or step back temporarily but we also found a way back to each other. that was only when we were just “friends” so you could only imagine how amplified that dynamic became when we were exclusive. we always told each other that we could never live without each other and we wouldn’t be able to move on, yet here we are in full no contact. i know to some degree it was lovebombing, but i just got so consumed by the idea of someone being there for me no matter what and i truly became fully convinced we would never be without each other.

now i’m isolated from everyone, i haven’t even gone outside that much because all i did was spend my time with my ex, and i just have a hard time adapting back to reality. i have no friends, my family is always busy and i’ve never been the type of person to reach out for help, and i’m not in school or working anymore so i don’t have any like close proximity to anybody to actually make progress on making friends. the only person i could think of that i could reach out naturally to without it being too weird is my mutual friend i had with my ex.

now this friend never really knew us as a thing. i met this friend all the way back in 2021 and my ex in 2022, it was just a coincidence we both knew her. i also haven’t talked to her since 2023 but we did use to vent to each other quite a lot and things didn’t end off badly between me and her. so now i’m just wondering, would it be weird to reach out to her after all these years? my therapist said i should work on making new friends by doing shit like Bumble BFF and time today or whatever it’s called but i just can’t commit to that right now. i can’t even stand to look at myself in the mirror let alone meet new people so this sounds like the safest option to me, but i’m just afraid that i’ll overwhelm her. but i also can’t assume anything unless i try it, so is this one of those situations where it doesn’t hurt to reach out? or would my connection to my ex just make things weird or potentially even worse for me while in no contact?

i know i lore dumped here (apologies)