Fmr. male teacher/friend keeps trying to "help me," doesn't want sex... what does this mean?

[two_design_kitties]

Before I go further - please do NOT bother responding to this if you are going to judge or run a riot act as I'm trying to find answers to help me figure out a productive response.

To make a very complicated story short, a former teacher/prof. of mine from school had the hots for me - but he's married. During that time we were working together as teacher/student, worked well together, we would pay each other compliments and send cute messages to each other regularly. We grew close, got too close.. I mistook his advances for sex, questioned it and he adamantly said he wasn't there to have sex. After several months of emailing/talking back and forth, I decided to Stop the whole thing and just ask for us to be friends. I gave some thank you gifts for helping mentor me on my projects and stopped seeing him.

I'm finished having him as a teacher now, but he's now again... emailing or posting things online, that I know are directed to help me or about things I'm interested or focused in my career on his Facebook, Twitter pages. I am almost absolutely certain they are there to bait me again.

So the old adage is a man doesn't help a woman unless he wants something in return. What is this about? I'm so confused, I grew to have very strong feelings for him and don't want to get burned again. Part of me is thinking he wants something "special" with me as he doesn't seem happy with his life, yet he doesn't tell me anything - while always wants to help me out or see me. Thanks.