After a break up my ex got too nervous to come near me again?Why is she unable to come near me?

My ex fiancee was going through a lot of stressful situations in her life at the time we were still together.Her life was falling apart.Things going wrong in her life.At some point we broke up.Despite trying to get back together again she has become too nervous to come near me.She would drive past and stop 2 houses away and get out the car.This was usually if I was out the front at the time she would stop,get out the car and try to talk to me.It never worked.She just wouldnt come near me.

This has been going on for ages.Her sister got involved trying to help the 2 of us talk.She would get out of the car,walk over to me and hand me her moblle phone(cell phone) and my ex and I would talk.This was an ongoing thing for ages.But now she's so nervous she wont even talk over the phone.Between my ex,her sister and I we are all frustrated.We have become strangers since.Her sister doesnt understand why I have given up.So she's upset about that too.

I finally gave up despite both women continue to turn up.I need to know what going on in her mind? Why is she too nervous to come near me? I know she is frustrated more than I am.I know her sister is trying to get the 2 of us to talk.and it is frustrated.How do I resolve this? I know her and I can never be together again.She just wont come near me.What am I supposed to do?