Hey healing-
You found this place for a reason, probably because you're reading a lot of stuff that is very similar to your ex's behavior. This site exists for a reason too, because BPD is really a thing, you're not going crazy even though it may feel like it right now, you're not alone, and there are a lot of answers here.
Its so hard, I want him out of my head so I can move on.
That's a good goal, and good focus on the future. How long was your relationship and how long has it been over?