capacity to love someone.

My boyfriend has a daughter that I have not yet met. Its been 10 months since we have been dating and friends for a year before that. He loves her so much, he is such a good daddy. He says he is scared to introduce me because he doesn’t want the relationship between him and his daughter to change. He says doesn’t want her to think he loves her any less. This makes me wonder if he will ever have the capacity to love me…I love him and he says he loves me but is deciding whether you want someone in your life or not a characteristic of capacity?