Mum's death has sent lover crazy

MY girlfriend's personality has changed out of all recognition.

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She used to be loving and calm. Now she's wild and unpredictable. She’s jacked in her job and is running riot.

I accept that suddenly losing her mum to cancer last October was devastating but I don't know why she’s taking out her frustrations and anger on me.

From shouting at me and taking my money, to going on three-day benders, she is out of control.

Fight

Now she's sleeping with my estranged best friend (we fell out over a failed business deal).

She's bringing him to my flat while I’m at work and sending me X-rated pictures to prove it.

I know she’s hurting but why is she pushing my buttons? I wasn't responsible for her mother's passing. She wants to provoke me into a fight but I’m not interested.