Should I let him invite somebody that hates me?

No, why would he want to invite someone who hates you?

Why would he WANT to invite someone who hates you? No.

Basically he is a very trustworthy person and she helped him through a hard time in his life but I never felt comfortable with them hanging out together without me so he really stopped hanging out with her but she reaches out to him every once and a while. She moved states and is not much of an issue but she has a valid reason for hating the ignorant me of 4 years ago. I tried hanging out with them once and all she did was throw shade.

Ummm...what? Hell to the no.

Why would he want to invite someone to the wedding who openly didn't like you? I'm all for being friends with whoever you want, but he should have ended that friendship with her if she openly "hates" his soon to be wife. Just my thought.

Um, nooooo! She does not like you and obviously probably isn't too thrilled with your engagement. I would not invite her at all and I am sure she would not be surprised anyway.

Poof...two spots open.

Nope. Absolutely not. Tell your FH it's not an option. You two should be inviting people you both want to spend your wedding day with.

People change, so even if she didn't like you then, she should still be giving you the benefit of the doubt, and respecting your FH's decision to be with you. If she can't respect you and your FH's judgment, she shouldn't be given the respect of inviting her to your wedding

Nope. This is to celebrate you and fh becoming one.. No need for the added stress