Guys who are insecure can hardly be expected to do anything well. Firstly, meeting such a man, you will always be “free ears” for him. And you will have to listen to his problems forever.
You will need to constantly reassure and cheer him up. That is, at the expense of you, he will try to raise his self-esteem. Secondly, most of the time your beloved will be fixated on himself and his feelings. This means that he may not have time for yours. And, to be honest, they are not very interesting to him.