Is it justifiable or wrong?!

Hi ladies! I'm looking for some advice regarding a situation I'm torn about

Some background information. My boyfriend is a professional soccer player. He used to be close with a guy on his team who would always cheat on his girlfriend. It was well known with all the wives and girlfriends of the teammates that he wasn't someone we wanted our men around. I never said anything to my boyfriend because I felt it wasn't fair to tell him who to hang out with outside of his job. Well I found out a couple months after we started dating that he cheated on me with a girl who was friends with the other guy. I also found some text messages with the other guy which basically sounded like single guy talk. Talking about hot girls etc. I broke up with him for a few months and got back together with him because I really did believe he was sorry and would change. It's been three years since and he's been really perfect since then. Problem is that guy moved away a couple months after I found those texts and now he's coming back to the team. I feel really uncomfortable with them being friends again. It brings back painful memories. And I'm not saying it's the other guys fault for what my boyfriend did. Blame is 100 percent on him. I just don't feel good with him being around that other guy because he's still the same way. He's always inviting my boyfriend to get togethers with girls etc. And he never acknowledges me. He's exactly how he was before! Should I express my feelings?