I'm happy to read that you've left that toxic friendship behind you, in your past. We all have toxic friendship stories to share. Believe me!

So many red flags with her for you, that should have clued you in as to drop her like a hot potato:

-she NEVER reciprocated equally with emotional support
-the friendship was lopsided/one-sided: you gave, she took
-her emotional manipulation through her so-called suicide threats; she did that to keep you hooked emotionally as narcissists will do. You were her emotional supply. People like her are emotional vampires.

Stay away from her. She will breadcrumb you to come back. Use what's called the "Grey Rock" method with her, should she text or email or call you again. Just don't respond. Ignore her. Consistently. Do not respond with a single word b/c when you do, that signals to her that you are still emotionally hooked/enmeshed with her friendship and will be available to her crazy toxic behavior.

Not everyone who crosses our path deserves our friendship. Be more picky. You are a very caring person, Fuzzy. Don't be so quick to give your friendship to everyone so freely, without some boundaries in place first, to protect yourself and set limitations with the other person so they know what lines not to cross with you.