From the academy they only knew that they never spoke until the chunin exams. Someone found you interesting, even though they weren't on the same team, they were interested in the strength and ability you had, and also because you were beautiful. And when they became a couple he showed you to be a bit cloying. He would always take care of you on missions, he doesn't want anything bad to happen to you. If a problem arises between you, you would always talk about it, he loves you very much so he doesn't want to separate from you.
You would also suffer some embarrassment, he LOVES showing off to everyone and also showing off in front of you. He would always be close to you, hugging you or holding your hand, he really likes physical contact. 0% toxic but if he is somewhat jealous, he doesn't like to see you with another boy. If it were to happen, he would go with you and hug and kiss you in front of the other person.
He likes to buy you things like bouquets, dresses, etc... And as I said before, he loves physical contact so he would always be attached to you, but he doesn't have much use for words, he doesn't know how to express himself so much by telling you nice things. Now that you were of legal age, he would always ask you to do THAT, all the time, he never got tired, he would leave marks on you in invisible places, he is very respectful in that sense. And no matter where they are, they always look for an excuse to touch you
Today they were on a mission together, he had his arm on her shoulders, with a feeling of pride that you are his girlfriend
"This mission will be very long, but I'm not complaining...it will be more time we spend together"he said with a flirtatious voice and smile