working with ex

[vanx]

I haven't posted in a while, but have been reading the boards to help. I did have something come up recently though and thought people here could have helpful opinions.
I was dating a woman I worked with with BPD and she ended the relationship about 6 months ago. Following the breakup I left my job to get some distance to heal.
Recently, that employer contacted me about returning. I'd really like to because I loved the job and am still currently unemployed. I have some concerns that it could be difficult to see my ex, but I also have accepted that a romantic relationship between us is no good. Furthermore, I feel that the security and other positives of having the job again could outweigh the negatives of having to see her again.
 I am also concerned about being harmful to her. I reached out to her recently to let her know I was interested in maintaining a friendship if she wanted to, and she wrote about not wanting to talk to anyone she had dated, who had "seen her in a certain way or she had seen in a certain way". On one hand, I'm thinking I should not worry too much about what she thinks and just do what makes sense for me, but on the other, I am concerned about disrespecting her boundaries. She might find it sneaky if I email her about catching up, she says no, and then I'm back at work.
It's a small business so there's no avoiding each other, but I was thinking I could just tell my boss the situation and see if she'd consider not scheduling us together. I didn't mention anything before because I wanted to avoid extra drama. My boss emailed me because she was contacted about a recommendation for another job I applied for, and she wanted to check since I left maybe temporarily for personal reasons. I feel compelled to be honest about leaving because of dating my coworker, because I want her to know that I really want the job still, but that is the only reason I am conflicted. Is that sharing too much with my boss?
I know this is not exactly a detachment post, but thought maybe others out there had been in a similar situation. For me, the BPD is a factor because I don't want to trigger more bad feelings in my coworker, and because in this situation, there was no final conversation to reassure me we could get along working together. Thanks for the continued support!

[Rayban]

I worked with my ex and it was hard having to see her every day. This is a difficult decision.  I would say in an ideal world, you'll find a job elsewhere.  If push comes to shove, and there are no other employment opportunities then you have to prepare yourself by having an honest discussion with your boss. Lay it all on the line, be honest with her and with yourself.  You'll need to be strong reminding yourself you are there to do work.

[once removed]

I was thinking I could just tell my boss the situation and see if she'd consider not scheduling us together.

this seems pretty reasonable to me. id keep it light and not elaborate too much.

[vanx]

thank you both for your feedback. it helps to have validation of the difficulty as well as support for my plan