What to do? What to do?

Few years ago i got in touch with a old bf one i loved more then life. He lives in another state currently so our main form of communication is social media. When we got in contact after Many years of no contact i had a new relationship i was honest with him. He would often bring up our past and once i found myself talking to him on the phone i realised what was conspiring i stopped it. He met someone and disappeared. Fast forward a year later he found himself in a low place he reached out to me. And i was again kind but even more distant i felt like he was at his worst and just needed a ego boost. 10 months we went without talking but suddenly hes back and is sending puzzeling messages. Im worried about some of the things that come across social media posted by him mostly. It seems to be leaving his other friends very confused as well. I feel like i understand what hes doing or saying. Im just not sure how to tell forsure. Or why he expects my reaction to be so currently i havent reacted at all. However i am struggleinf with being entertained by his games and worried for him.