OK, now for the ex; they were together for 7 years, and he was honest with me and told me that he had made her life hell, and he went to prison on drug charges and she left him. When I met him, they had been a part for almost 3 years. But when I asked about his past relationship, you could see the hurt he felt (he's clean and completely different to how he describes his old self). I knew he didn't have closure and could sense it, but he reassured me that he will never get back with her and that he loves me and wants to marry me, etc.
I'm not jealous nor am I intimidated by her, but I am of the opinion that exes are history. It annoys me when she sends him messages telling him she wishes he were there and sends him songs they once liked, etc. But at the same time she says she's happy for him. He asked if it bothers me that she writes to him, and I said that I don't like it but that I will leave it to him to make a decision. How should I handle this situation?