Relationship

How soon is too soon to start talking to someone new after being in a relationship for a little over a year? I was the one who got broken up with, (Jan 19th to be exact) and was told there’s a possibility of us getting back together... but he hasn’t really been seeming like that’s even a possibility that he’s interested in. Enter new guy. He messaged me on the whisper app and we’ve been talking for the past two weeks.. We’re just friends as of right now, but he wants to be more. I still feel like it’s too soon, but I don’t want to cling to false hope with my ex...and I like this guy. He peaks my interest. Help, please.