Do guys know when they do this?

When a guy is toying with your emotions. Leading you on. Won’t answer you if this is something or not. They say the right things, so the right things to make you think they like you but then are sleeping with other people and/or not interested in anything but you being an ego boost and emotional support.
do they know that their fucking with someone’s emotions and they just don’t care? Or do they not know what their doing that to someone?
Do guys know when they do this?
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