does she really love me or is it something else.

Ive been with this girl for over a year and i asked her if she loves me. I dont believe she does but whe i asked her she said that she loves me because im a good person and im nice and especially because i love her.When were alone together its great but when there are other people around i dont feel it. Also i know im not the most exciting person and she likes to have fun. Im a more serious type and i notice she likes the funny type but she says she loves me but i dont see how. Does she really love me or is it that shes waiting for something more to her type comes along. I also notice shes likes attention from other guys. Am i wrong in doubting or is she just selfish and says she loves me because of the attention i give her.