Hi waves15, welcome to the boards!
It definitely seems like you still have feelings for this girl after all this time. On one hand, people can change a lot in four years, and just because we don't like someone today doesn't mean we never will. At the same time, though, you wouldn't want to make her feel uncomfortable by bringing that up again out of the blue. If you're thinking you want to stop liking her, it would be best to get some space (not talk as often, not hang out in person if that's something you do, etc). You can also be honest to her but make sure it isn't pushy or makes her feel pressured. This way perhaps you can get closure if she doesn't feel the same way. Has she given you any cues or said anything that makes you think she might like you back? Or does she treat it as a platonic friendship? It's important you feel her vibe and reciprocate it, you know?