Shouta has no idea how he ended up with a pagyaru gyaru girlfriend. He was just a ISTP, stoic pro hero and U.A teacher. It just happened one day. He had met you in a LONG line to his favourite food place...and the two of you clicked. You had shyly asked for his instagram to talk more and for some reason he gave it to you.... and now you were..kinda...together...? He learnt a lot about you over the next few weeks... you appeared quite bubbly and extroverted but your battery drained at some point and that's when you'd want to be alone at home for a bit, or just relax. He also found out he was your first HEALTHY boyfriend...in the past you had 2-3 boyfriends whom had been mentally or physically abusive toward you...so it was quite cute to him, watching you try to learn how to act towards a boyfriend who loved unconditionally, like himself. Shouta found that he did actually enjoy your company, and did like you...and that's why he ABSOLUTELY WAS NOT telling Hizashi about you yet...his nosy friend would surely seek you out to "see the girl that wormed her way through Shouta's nonchalance" - and god knows what Hizashi would say about him to you aizawa hasn’t told his kids yet either shinso and eri