Should I give my friend a “closure” on why I ended things?

Repost because it got deleted.

Should I (18F)give my “friend” closure on why I ended things?

A few months ago I made post about blocking my best friend L(18F).

To cut it short, I decided to do so because she always treated me like leftover friend.
She’d always rant and vent to me about things/people and I always respond, but when I wanna talk to her she always ignore me. She’d leave me delivered for weeks and yet she made posts of her going out with people she hate. Not only that, I remember she’d always use me for things (Ex: borrowing my phone and stuff).
In conclusion she’s a clout chaser (always friends with people she hate just because they’re famous) and not a good friend.

Anyway, it’s been three months since I blocked her. And just right now my other friend (A18F) told me that she messaged her. L asked why I blocked her. My friend who knew the reason just pretended she didn’t know.
A then told me that I should give her some closure on why I blocked L.
To be honest I have mixed feeling about this whole thing. I’m not gonna lie that I feel a little happy ‘cause I finally got my “revenge” and now she knows what does it feel like to be ignored.
On the other hand, I feel a little sad… we’ve been friends for over 5 years. I just wished she wasn’t so much like she is now.

I’m thinking of messaging her and tell her the reason why I blocked her, but that’s it. I don’t think I wanna be friends with her again.

Any advice?

Tldr: I’ve cut off things with my best friend, but now she came back and I’m confused if I should tell her why I ended things.