Honestly, I know he won't. I really do trust him, but it was just the fact of how long they dated. I remember when they were dating it was on and off for a few days but I don't know. When she dumped him last time she said she did it because she thought she could do better. He's told me he'd never leave me for her and I believe him, it's just the 'first love' thing that bothers me. She was his first love, and I've never had anyone before him.