I have been in a long-term relationship for just over 2 years now with my girlfriend. I am 18 and she is 19. At first we had a bit of a rocky start with each other, but with time we've been able to forgive each other for our misdeeds. Now the relationship is very stable, and very loving, but it is only I who has a problem now. I do love my girlfriend, and I enjoy the comfort of the relationship, but at the same time, I am not sure if I want to be with her for the rest of my life. I enjoy the comfort of the relationship, but at the same time I feel like breaking it off with her and dating other women. I'm afraid of true long-term commitment (IE living together, marriage etc.), but I'm also afraid if I break it off with her, that I won't be able to find something as stable ever again.
My question comes as simple as this: Should I break up with her, because I don't know exactly what I want in my love life? This is really tearing me up inside, and any advice offered would help me a bunch.