My boyfriend cheated on his ex-wife alot..Should I be worried?

Ok my boyfriend cheated on his ex wife multiple times. Here's the story. It started when he was 21. They had been married for 2 years. He met a 16 year old girl and began talking to her. (no ) His wife found out and they separated for 3 months. During those 3 months he cheated on her with 2 different girls. He and his wife got back together--1 year later he cheated with 2 girls from his work. They found out about each other and he had to get transferred but his wife didn't know. He then slept with two other girls he met, found out his wife was talking to someone when they were in the middle of their second separation so he got her pregnant. (they got back together) 3 months into her pregnancy he ws cheating again. Now he's divorced 26 years old nd with me. He's never cheated on me, (we've been together 2 years) but I'm scared to death, especially because I divorced my husband because he cheated on me (once). He said he's changed and I should forget about his past because he is changed. I've only been with two people ually(one I was married too the other is him), I'm not the one night stand kind of girl --I only have when I have feeling for someone so his past kinda disgusts me. Anyway advice please. Like I said he has never cheated on me and is a very good attentive boyfriend.