What is the most logical next event?

How to make a guy that used to like you like you again
Start chatting again.
Even if you haven't spoken in a while, talk to him casually to reopen the doors of communication. This will put you in his mind again, as well.

Choices:
(a). Say " hey greg, nice shirt " when you see him passing you in the halls at work or school. You can even send him a quick text saying something like " even though they're not my team, congrats on carolina winning the national championship..
(b). Also, ask him lots of questions about the happenings of the day. Asking him about his days, his hobbies and his kids is another amazing way to get to know one another in new ways..
(c). After you've spoken, smile and say something along the lines of " hi, it's nice to see you again. " showing that you're talking to him can give him a little boost; it can also give you a chance to touch him back too..
(d). As long as you are less than 3 seconds away from him again, you will remember him. Look at him when you see him again, or spend a few seconds looking at him from across the room..
(a).