Too soon to move on?

Came out of a four year long relationship only 2 months ago. Only 3 weeks out did I feel good again and now I’m talking to this new guy. We’ve made out and gone on multiple dates.

Is it too soon??? Am I being unfair to the guy I’m talking to? Like we aren’t dating, but I feel like we could soon/eventually. I don’t think about my ex anymore other than negative things and I’ve noticed some eerily similar things between my ex and this new guy but nothing crazy - just like fav restaurants/foods, same pets, sports they play.