Search Results: express true feelings

So my little bro (18yrs) has had huge crush on this girl (let's call her girl "A") since 7th grade and never dated a chick but everytime she reached out to him in a romantic way (cause she likes him too n has since around that time and has told him so) he would act only in a friend way towards her but she knew he liked her... He's not shy around other girls just to her to (WHEN it comes to flirting he can talk to her in friendly non romantic way) which is understandable. he pretty outgoing to be honest and class clown too!! But here's the kicker... he asked another girl (let's call her girl "b") to prom and has been causal with her since then and has no desire to date girl B even tho she would like to be with him. He even told me that he loves girl A and that girl A loves him too and they have express this to each other when she was heart broken over the prom situation he says he reassured girl A that is feelings haven't changed for her and him and girl "B" aren't serious but it's HIM and ONLY HIM who continues to be causal with other people despite the love that my brother and girl A have... can you guys give me clarity in this is it just imauraity or what? Like girl B was threatened by girl A she went on my bros fb and blocked girl A ( I don't know why he would let her do this) this make no sense and Ik all of this is true causes he's shown me physical proof... my little bro isn't a player he such a sweet kid who has good intentions tbh (not only that but we live in a small town so I he was being a little man whore I would know lmfao) what do you guys think is going on in his head (cause he doesn't wanna talk about it with me) that makes him do this? I mean this causal relationship that he has with girl "b" isn't even anything like they don't even kiss (and girl "b" has had a boyfriend before so it's prob him that won't kiss her or something idk) I'm just concerned about my little brother... can you blame me? If u need more info I can update the post just comment lmk