This isn’t an issue with men specifically, it just seems that way because you (probably) don’t date women. It’s an issue with people being shitty and vapid and having short attention spans. I also blame dating apps, they normalized ghosting people WAY too much because people suddenly had literally 100x the options
Case by case basis. Different situations have different reasons. Maybe he was afraid you’d get clingy if he led you on, or maybe he saw your red flags, or maybe it had nothing to do with you. Honestly you have more information than us atp. If you give us a hint, we can help you interpret it, but you gotta be honest and reflect on the intel you have