Hello everyone.
Been with my bf for 1.5 years and have known his daughter for a year. We had a great smooth start to the relationship/friendship when I first met her and I always made an effort to bond with her such as doing small activities at his home with her or taking her shopping and buying her something she wanted, driving her to McDonalds to buy her something to eat when she requested and learning how to make soup the way her grandma makes it (because she’s very fussy with food). I have given a lot of myself and even spent money on her when I am only working a meagre casual retail job and don’t receive much money. Initially, she would always run to the door when I came over or hugged me or wanted to be with me. Recently, her behaviour has changed towards me. For example, my bf’s mum bought us all mugs with the first letter of our names on them. While I was sitting down, she took my mug (which was next to her dad’s mug) and put her mug in place of my mug next to her dad’s mug. I asked her why she did this and she said she wanted to be next to dad. My bf and his ex wife have been divorced for 6 years now and she is due to be married again this year. It really hurts me that his daughter acts this way even though I’ve done so many nice things for her. I am a sensitive person, so I take this behaviour personally as a signal that she doesn’t like me being close to her dad, or doesn’t like me at all. What should I do? Should I have a talk with her or just laugh it off??

Some advice would be appreciated a lot! Thank you!!