My sister-in-law wants to be my best friend, but I noticed her bizarre behavior

Dear AmoMama,

My husband and I married 12 years ago, and we are very happy. We opened up our own online business and we've done very well for ourselves.

We are in our early 40s and we never wanted children, so we are able to travel and enjoy our success.

My brother who had been working in Dubai for 9 years has finally come home, and he brought his wife with him, an Australian girl he's met and married there.

'Erika' is a very friendly and exuberant girl, whereas I am more reserved, but we developed a friendship. I considered her family, and she didn't know many people, so we started doing all kinds of girl things together.

We'd go shopping, have spa-days, play tennis, have lunch - and it was always at my expense.

I could afford it, and besides, I enjoyed treating her with the clothes she loved which were out of my brother's reach. I thought she cared for me, I really did.

A week ago, I'd planned to meet her at a pretty little bistro we both loved. We had a lovely lunch, but afterward, to my horror, I realized I'd left my purse at home.

I asked 'Erika' if she would mind taking care of the bill since I had neither money nor credit cards. She agreed, and I went to the bathroom while she settled.

When I returned she was on the phone and I heard her say: "That stingy bitch stiffed with the bloody bill!"

I was so hurt, so shocked. All this time I thought she was my friend, but she was using me, getting everything she could out of me.

I don't know what to do. I don't want to hurt my brother, but I can't pretend to be her friend either. Should I confront her? Or simply pull away?

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