>start dating very attractive girl at 19 who I had known for

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>start dating very attractive girl at 19 who I had known for a while
>fall in love with each other very quickly
>we don't have a lot in common but have a lot of fun together
>she spirals into depression because of some home issues
>I gravitate towards the role of being her "rock"
>she loses all her other friends
>tells me all the time how she doesn't know where she'd be without me and how she loves me
>very genuine affection for me, can't imagine her ever crossing me
>at 21, start to get spooked because we are getting really serious really fast
>she's still my first relationship, can't help but doubt maybe there is someone else out there who understands my humor better or I have more in common with or some shit
>also start to feel immense pressure to keep her in a stable mental state
>it gets to be too much, broke up with her in June
>she begs for me back in the weeks to come
>I try to stay decisive
>she eventually says she accepts it though she doesn't understand my reasons and still wants me back
>we hang out now and then and hooked up once or twice because I'm only human and weak
>still love her and miss her like crazy, but can sense that with each passing day she misses me a bit less and will eventually move on
>happy for her to do so but also can't bear the thought of losing her permanently

How do I stop being this selfish? Did I make a mistake? I feel like I need this time as a young adult for individual development and gain more experience on my own so that I can know who is right when I find them, but also can't shake the feeling that no one will ever love me the way that she did.