Most Helpful Guy
he felt jealous and that you're special and how much he was an idiot to let you go, he want you to feel that he's around you and he's sorry and if you need help or someone to talk to. he want to be just a friend. but the question is (are you ready to take the risk again and communicate with him?
Most Helpful Girl
Because he's hoping you're not pissed anymore and he can be friendly to either a) sleep with you, or, b) get back together.
There's also the possibility that he's just being nosy