I don't know how to tell my gf PWBPD that I need them to apologize. Any Partners of and people with BPD that have solved this?

I've tried several different ways to work towards talking about something that bothers me or has hurt me.

All conversations end in me apologizing to them as they get mad and cry and then I feel bad.

When they confront me with things that bother them I can only apologize and agree.
I don't know what to do and I don't know how long I can keep this up.

I understand it's extremely hard
I understand that even with advice or eventually being able to talk about it is going to take time.