Izuku liked you, a boy. You both went to UA, and he was way to shy to admit his feelings to you, I mean, he knew you liked some girl anyway. He had no chance against that.

The green haired boy would watch you from around a corner, his eyes only on you, not moving away. Izuku was watching you talk to that girl.

He just wanted you to notice him, was it to much to ask for? Hell, at this point he wouldn't mind just being a friend. But the feelings of love won't ever go away.