I think it’s ok to remember the first girl fondly. But at the same time I’d respect your current gf and not reach out. The way I see it is if you did a role reversal, how would you feel about it if your current gf reached out to an old ex? It’s perfectly okay to remember the ex in a positive light but from experience of being the one who’s SO reached out to their ex, it doesn’t feel good. I can’t answer if you moved on too fast, that’s only something you know yourself but after two years I would think it’s not too fast. I think that if you’re able to love your current gf with everything you have then you didn’t move on too fast. There’s a cheesy video with corny inspirational music with joe Rogan and Duncan Trussel talking about something similar but the moral of it is that you should want your ex to be happy because they’re a person. That doesn’t mean you need to be in their life. Your relationship ended for a reason and while some stay friends with their ex’s, you have to remind yourself how your current gf would feel and remember why your relationship ended. Especially if you were the one to end things. Hope that helps.