Since you have been friends for quite a while, he knows what he is getting himself into. So, it seems like a good idea to just enjoy the relationship that is developing. Of course your primary focus is getting better. But, I think having a good friend who is willing to really be there for you and maybe even become something more can do a lot of good for a person. So I am hoping that you will try to be open to the possibility of a deeper relationship with him. However, I know that I would have a problem in this area. So, it really is up to you on what you feel capable of at this time.