Most Helpful Guy
First, don't be a ping pong ball, that just says you are highly insecure, and his going along with it means the same for him. If you "are afraid to lose him", then you have some maturing to do and this relationship is harmful to you. A good relationship is never based on any kind of fear, including fear of loss.
Second, you are too young to be trying to find "the one" and you put way too much emphasis on a relationship. People who marry young have a high divorce rate, and there is a reason for that. And there is no such thing as "the one" anyway. People are capable of loving any of a large number of potential matches.
Your only dating goal at this point in your life should be to learn, to learn about you and to learn about the kind of man you will ultimately want to be with, which is not the kind of man you are with now. And sex too.
Try to date different kinds of guys, maybe include a bit outside your comfort zone, but keep your emotions in check. Be careful with sex, because young women who haven't been with a lot of men sometimes think they are in love when they have sex with someone. There is even a physiological trick that a guy can do to a girl to make her develop emotions for him and it really works, but that is bad for the girl because it bypasses her brain. Think with your brain, not with your feelings.
Try not to commit yourself into a relationship (casual and non-exclusive is fine) until you are past 26, have a stable job and are living independently. That will be the person you will be for the rest of your life, and so you will be able to find a good match to last.
Most Helpful Girl
Breaks never work.