He placed his arm around my lower back... is he flirting?

It seemed he still has feelings for me. What do u think? Ex-bf said... can you come back to see me soon? Is this guy flirting? Some ppl think my ex-bf is flirting with me... what do you think? He saw me recently and it seemed he still has feelings for me. He was quite interested in my dating status. I'm single... I didn't say I'm still in love with him. He was insistent I tell him why I chose to be alone. I said I had been sick and didn't have room in my life for another person. At one point, we were walking side by side and he placed his arm around my lower back. Then he stopped and said... You know what... can you come back to see me soon? I'd love to get back with him. That is why I don't want to read something into this exchange that wasn't there to begin with. I strictly want to understand if he is giving me a chance.