Pleasssseee help me

Okay I read this manga so long ago. Is a yaoi manga where The uke and the seme have been going out for a while and the uke is a super nice and bubbly person and the seme really likes that about him. (The seme is also a nice guy) One say the uke like has sexy with the seme and was like "this is how I really am are you disappointed" or something like that and the seme was taken offguard by the ukes action and the uke turned out not to be a super nice guy. PLEASE HELP ME