Dying inside.

Hello.
Even if I get no responses it will be therapeutic to right this down.
I have known my ex for a long time. She works at a customer of mine.
4 years ago we started dating. I left my wife for her and things were great.
He father was diagnosed with Tumour and after long fight passed away. I looked after her all through this and took all that comes with the grief and anger of loosing someone. She got through it and we carried on well. We got engaged and things were, as far as I could tell great.
Last Friday she said we needed to talk, when she got home she told me she no longer wanted to marry me and didn’t love me anymore. To say my world fell apart was an understatement. I, unfortunately reacted badly and begged her to try to work things out I have sent her many messages about how I am lonely without her.
She is the sort of girl who likes to flirt and show off her cleavage. I have made many comments yo her about this and she said Friday that I make her feel stifled and trapped. I just can’t see what I can do to win her back
She says there is no one else and I can only take that at face value.
Although she always hid her phone and deleted things straight away.
I am falling apart. I am 43 and have had to move back with parents for the moment.
Just want her back I have not txt her at all today. Although I am desperate to talk to her.
I am trying to give her space to breath and to hopefully remember we were a team.
I hurt.