Yes, I'm sure age does play a part in this. It makes more sense that he's playing the field at 22 than if he were older. He has many years ahead of time to decide to settle down. The bad news is that, if and when he is ready for that, he is even less likely to choose one of the girls he was FWB with in high school/college. When he grows up, he will probably be more interested in a woman who demands more respect and has not been chasing him around his whole adolescence. By the same token, when you grow up a little more, you will probably think this guy was a loser and want to be with a man who treats you better also. You will probably demand more from a relationship. it doesn't sound like either of you love one another. Rather, it sounds like this little triangle is the only thing you guys have ever known and you are holding onto it because you are afraid to let go. It sounds more like an obsession or bad habit than like genuine love or affection. It sounds like there may be some co-dependency issues going on here. Since you guys are not exclusive anyway, why not do a little dating around and get some more life experience under your belt.