“Should I still be friends with this man, or is this my clue that he is just playing me?”

Didn’t you feel he was playing you right from the beginning when he told you he was ‘thinking about leaving her and pursuing you’?

In hindsight you now probably wish you told him, ‘When you leave her and still want to pursue me let me know.”

Did you think he was going to commit to you? From what you say it sounds like that was only your wishful thinking and he showed no intentions of doing.

Does this ‘friend’ bring so much to your life that you still want to keep this affair going on? If knowing he will never commit to you is enough to end all contact you are certainly doing yourself a favor to protect yourself from further harm.