Most Helpful Guy
He is trying to make you jealous and make you feel that you made bad decisions of breaking and to make you run after hin
Most Helpful Girl
He wants you back. He was only willing to do the bare minimum to maintain the relationship and keep you, and now he sees that's what lost you. So now he's going that extra mile to try and show you that he's worthy. When that didn't work, be got a new girlfriend to try and make you jealous.