Search Results: how can you get a guy to stay away

One of my male coworkers and I had genuine feelings for each other but we never made any move because he had a girlfriend. I always kept distance out of respect for that girl. We admitted our feelings earlier this year but he gave me very confusing answer implying its difficult as he and his girlfriend have talked about marriage. I stepped back and avoided him. he realized he has hurt me. after 2-3 months, i noticed what seemed like he was texting on a dating app. I stayed quiet and away. i could tell he had started seeing another woman. In last 3-4 months, he started showing interest in me again. i didn't act as i thought he has a girlfriend.
recently, i got to know that he has bought his own apartment and his girlfriend has not moved in with him. also, he has asked two of my female coworkers if they know rich single woman. clearly he is single again but at work he has not openly come out as that. if i avoid him, he gets very interested in me and flirts with me. yesterday i gave him a box of chocolates for Christmas. he was very happy but after sometime, i heard him loudly mention his girlfriend to another female coworker. it seemed like he was wanting me to hear that (he has done this before too) - sort of pinching me and trying to give the false impression that he is still with her.
i felt so hurt. i really feel like telling him that i know what he is upto recently (he single again, seeing another woman and looking to get introduced to rich single women) and wish him good luck. should i do that or just stay quiet? lastly, i know from his behaviour that he still has feelings for me but is not pursuing me.