Listen to this and tell me your opinion?

This guy is a family friend. We flirted and hung out for all of quarantine. He asked me out serval times, but never followed through. Quarantine ends he takes another girl out. They start dating, I’m heartbroken. I finally heal from this, 4 months later he messages me and starts flirting. I said don’t you have a girlfriend. His response is that it’s an open relationship. I didn’t respond I just left him on seen. Wtf is wrong with him. You lead me on and give me false promises. Then you go for someone else and try to come back and flirt with me. Can men explain this to me? Am I missing something?
Listen to this and tell me your opinion?
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