Despite the fact that Mikey was not cheating on Titus and was simply being the innocent, naïve Mikey that he is, Titus thought that splitting up would be best for both of them. Unfortunately, Titus' breakup with Mikey was the most mature thing he'd done in a long time. Titus deciding to split from Mikey was the best thing that could have happened to them. It gave them both time to think about what they wanted out of life and how they were going to get it. Also, since they weren't together anymore, there was no reason for Mikey to keep seeing her anymore. This allowed him to move on with his life and find Rebecca who she says is "the one." Now, as for Mikey, he too had decided to go after Rebecca. Unlike Titus though, he didn't just want a girlfriend - he wanted to get married and have kids. He knew that if he waited for someone perfect, someone who didn't exist, then he might never find true happiness. So, he decided to get out there and find it. In conclusion, yes, Mikey does cheat on Titus.