He took great responsibility in becoming head of his clan, and now that he had the status, he was supposed to keep it and and let it flourish.

He obviously needed a wife. A suited partner to grant him heirs to continue the bloodline. A respectable woman he would be proud to have by his side as the mother of his childern.

He had eyed you. You were coming from another powerful clan, so this match would produce an alliance.

He made up his mind. He had to have you.