Most Helpful Guy
There's always the lingering feelings that we have for people. It's impossible to completely remove all feelings and emotions for people, so him asking is merely a surface feeling of jealousy. It doesn't necessarily mean he wants to get back together or that he's still in love with you but it is him reacting to seeing you and having those feelings come up. There could be a lot of reasons why he would ask you, mostly because there is regret in breaking up with you. The only way to know is to ask him. Do you want to get back together or are you alright being away from him? It all comes down to what you want and how you want to act.
Most Helpful Girl
Maybe he regrets it? Or maybe he's an asshole who wants to see if you'd be very willing to go back to him.