Question ?

Okay so here is what is going on. My friend dated this for a while they broke up a few months ago. Me and him have been friends for a while and he is being a little more flirty than usual. Is it a bad thing that I kinda like him. ? Would it be a bad thing if he asked me out and I said yes. ? If I said yes would that make me a bad person ? I don't know what do you guys think ...