3 years..

3 years and my boyfriend is still texting his ex behind my back. He doesn't save her number to his phone so I can't see her name pop up but I know the number. He deletes the messages so if I ever use his phone I can't see what they've said to each other. He's cheated on me with her before and I don't think I'm so wrong to expect that after 3 years he could just let her go and move on.. But I guess I'm wrong.