This doesn’t seem like a trait but if you make someone around you feel happy and comfortable, it means you are a pleasant person and that is a trait and a very attractive one.
These women know how to create a situation in which their man will realize he is happy around them.
They will evoke deep emotions which are hidden inside them and if they leave, the man is going to miss that feeling. When this happens, it’s commitment bingo!
You have to do things which the both of you enjoy, you have to have fun with him.
These are the situations in which he will feel happy and secure. And if you leave, these are the situations that will remind him how satisfied he was around you. In short, he would want to commit.