Hey @Cinnamon_Bear ,
I hear you have been thinking about this for a long time. It must have been very difficult when you first started dating your boyfriend, to have this friend tell you it wasn't going to last.
I read that you feel this friend is 'super toxic'. I'm curious to know whether you still want or value her friendship. It's play if you don't, as friendship (by nature) change. However, if you do value her friendship, it's probably a good idea to have a chat.
As for whether to block/unfollow her, that is entirely your choice. If you feel it is doing you more harm than good, and you really don't think your relationship with this friend is going to continue, then there's no harm in blocking/unfollowing her. After all, don't we all go through our phones after a while and 'clean it up' to delete and remove whatever is no longer important to us?
However, I hear you feel you may give her the satisfaction of 'winning'. At this point, what's more important? Your mental health and wellbeing, or not giving her the sense of 'winning'?
Be guided by what you feel is best for YOU.
We support you in whatever you decide.