I could have written this post myself, minus a few things. I have ruined all my relationships because of my BPD and the behaviours you mentioned are things I still do. (although recognising them a little more now I've been diagnosed)
Creating crisis - well said. I understand this so much. Reading this post was like reading about myself. And the Idealising of people. I thought I was the only one who did that.

I wish I has some advice for you. I know I would want to do the same as you, but I also know how it might make me feel and that it could trigger me to go into a dark place. If you really want to see him this last day you have together, you might have to prepare yourself. I know how it feels to want to express everything to a person, too much in fact, and it does scare them off, but it's so hard to keep it in. If you need to get that off your chest try do so quickly and casually and then have an amazing day together. I wishing you much luck and hope it goes well. Sending big hugs your way.