Also a bit of a wwyd.
My mum's birthday is just before christmas so my sister and I have always bought her a big present. Last year her big present cost circa £230 and as per usual we agreed to split it down the middle.
In the past when she has bought I always pay her back immediately because she is a bit of a tricky fish and I know that likely she would come back to me using any debt against me. Anyway, last year my sister bought and I (thought I) gave her the money. Now 4 months later she is saying that I never gave her the money and that I owe her my half. Now my problem is that I thought I had given her the money - usually she is honest (although splits hairs within an inch of her life). But it seems strange to come back now asking for it.
She was fine initially and said do you remember whether you paid me back? But now it is more of an "I am certain that you didn't pay me back". We both have young children and are probably prone to forgetting. What would you do if you were in this situation? and AIBU?