Uhm that's not what happened? He rejected her bc he knew supporting Narumi through her trauma and hard time will bug Futaba. It took his buddy to get him out of it and clear his head when he made up his mind he didn't know she was dating Touma. He was acting like a child bc he is a child. A traumatised teenager. Touma didn't accept anything, he pressured her into a relationship, then was insecure despite knowing her really feelings. He didn't accept them and he did complain.

idk i just like more the ship Futaba x Touma. even if he looks like a pick me, somehow he really loved her.when kou was lying to futaba and rejected her. he was thinking like its a game to take her back.maybe they know each other since they were kids but that doesn’t change the fact that he was acting like a child.touma accepted futaba even if he knew she was still in love with kou. he accepted that and didn’t say anything.he didn’t complained about how futaba was hanging out with kou and that made my heart feel warm…