highkey you're doing more damage to yourself by not telling him. if youre the sort of person who needs that sort of emotional support or verbal confirmation/reassurance then its something important that should be established early on into your relationship to see if you two are even compatible or not. If he takes it badly or theres issues then hes childish and you should move on, if he takes on the feedback/criticism and betters himself then gg and gl to you and your relationship but you need to tell him
also dont ask for relationship advice on kings you fucking idiot, tf are you expecting to hear other than "bros a lame, cheat on him w me instead" ??