Did I do the right thing?

this guy stared at me and checked me out multiple of times... I went to talk to him twice... he was shy.. he told me to Check his fb... after he accepted my Request... I went through his profile rapidly.. however he would seldomly reply to my message.. then 1 day he removed me on messenger... found that strange.. went through his profile again... saw that he has a LD girlfriend... since then I distant myself from him and told him not to cheat... did I do the right thing? Now when he sees me.. he looks at me like then looks away
Did I do the right thing?
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