<human>: We met 5 months ago, Officially started dating 2 months ago. I would notice her text her ex a lot, and facebook posts as well, so I casually brought it up. I said if you still have feelings for him, then we can stop. She **insists** nothing is happening. Shes lied to me about not talking to him, and lied about the duration of their relationship, saying they dated 2 years. 

The problem is, the ex is still not over her. He wants to win her back. I don't know how to handle the situation. I am not sure if I am to trust her, and let it go? or Do I say this needs to stop? Its hard for me being the first relationship I have had, so any help would be appreciated it.

Give me a shortened version of the text
<bot>: Girlfriend still talks to her ex, she says she is over him, but he clearly isn't, what do I do?