I am asking and accepting a lot of support from him

and he can't go on providing for me like that. He is getting very nervous. I have mainly lived the other side of the story so far in my life. Now that I am on the other side i can understand his frustration but still I am accepting his help. It is really so difficult, when you are in need of help and the other is giving, and you see that they are giving beyond their extent or capacity, stretching their limits, it is so hard to say no and stop it, quit accepting.
But in such circumstances, the excessive help given returns as a boomerang, in the form of resentment...