Too cut the explanation short, Sehun is a kind of BF who's not so Sweet, Flirty, Bossy. Just an average. So he's not a Ideal BF you know. 
But he has some personality and characteristic that you will like at him.....
Tho I cannot explain in through words, but I know for sure you guys get it know what I exactly feel...
now*
He is one of a kind that cannot be compared to others....
Tho he may seem not be so perfect or ideal boyfriend, he is loving and caring. He do act like a child and not as a real man,
but that who he is. I fell on him for who is.....
him being gayish, him being so clingy, but that how he expresses his own feelings.......
He is the type of guy who will make you happy in different ways,
he will not treat you cold nor treat you so princess like...... just an average.
He is not one of those typical boyfriends.
To be exact, He is a Kiddo.
He is a great replica of Hyungjun.