showing no affection

sometimes i think my girlfriend doesn't really show me any affection. she acts like she doesn't want to kiss me or touch me sometimes. it feels like she doesn't even want me me as much as i want her. i told her about it and she said that she would start showing me more affection but i seems like nothing has changed.i guess I'll talk to her about it again but I'm not going to keep talking to her. i love her and everything but if she don't start showing more affection, I'm going to start to think she obviously doesn't want me any more so I'm going to do what i feel is the right thing to do.