I have to say, I was feeling the same way the other day (Supreme Court Ruling) and struggling.
If you need to discuss, msg me.

Do not approach the ex.
I can't imagine what it would be like to live in a small town and run into my ex all the time. I live in the suburbs and my ex after dumping me and hooking up with her ex is showing up where I go intentionally. I have to re-route my life.
It sucks but I am trying to look at the positives. A new gym, opportunity to meet new people. The thing is this. I have been sitting at home after work crying or sleeping. She is out living her life as usual.
Who has the control?
It's not easy but keeping busy will keep your mind off her. Of course when we keep busy our BPD ex's pop up for our attention.
It will get better. I know it will. For both you and me and everyone on here.
The day after our breakup I went to a Meetup. I didn't want to but I planned it and had to. At the meetup I met a girl. We clicked instantly and stayed out talking until late. It was great. She is going through a break up with a non-BPD and it is amazing how different our situations are. Anyways we are becoming friends and she is keeping me busy. I kinda find it a blessing I made a new friend as I lost someone. You just have to keep on keeping on because even though she was your world the world is big and there are a lot of others out there that do want you in theirs.