babey. This is your first question and it is hard to figure out. Does your boyfriend want you to change or do you want him to change? Either way, unless you can accept each other just the way you are, it is time to move on.
Because of the way you have written the question (What should i say when my boyfriend asked me what do i have for him to stay in this relationship?) it's hard to understand what the situation is. 1. He could be telling you that you should consent to sex or he is leaving you. 2. He could be asking how he should change so that you are happier in the relationship. 3. He might be trying to open a conversation about how to make things better for both of you. When you write questions here, you need to look at the grammar carefully so what you have written is really what you mean. Add some details so that we have a better idea what the questions means. Then we can give you good answers.
Tell him that what you have is strength. Then use that strength to tell him goodbye. When he begs to have you back, tell him that you are glad he is able to see what you have to offer. Then inform him that you are using that great character trait of strength to move past your relationship with him. Ask him what he has to offer you.