In this tutorial, Donna Barnes tells us how to know if your boyfriend still likes his ex. One big sign that your boyfriend is still interested in his ex-girlfriend is if he talks about her a lot. Also, if he isn't around a lot of the time and he's doing other things, he's probably not interested in you. If he compares you to his ex-girlfriend, let the relationship go, because he's probably just on the rebound and isn't looking for anything serious with you. Make sure to pay attention to how he acts, if you notice he's always thinking about other things or people, and still has his ex's things around his place.