7. He is feeling down and wants to be cheered up.
He might be feeling depressed because of work or something else, and wants someone to cheer him up. When some guys want to be cheered up, they start to hit up ex-girlfriends, since those exes have spent time with them and probably know how to get them into a better mood. It may look like they want to try to get back together, so if you are too nice to him, there is the risk that he might start actively coming on to you. Be careful.