What life lesson did you learn the hard way?

Thought I was pretty clear about the cheating by saying my ex had walked out on me to be with his new whore. My ex left me several months after I proposed and allowed an open relationship. I proposed the open relationship because I couldn't keep up with his sexual needs after starting a new antidepressant. Within a few months I knew I was losing him because he wouldn't even pay attention to me while we sat on the couch or laid in bed together. He'd always be on his phone with his new fuckbuddy. Eventually I told him that he was getting too friendly and that it needed to stop. It didn't. While he was on a business trip I told him that he needed to choose me or the Grindr whore. As soon as he got home from the trip he started packing and informed me he had already gotten a new place.

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