Sex as a proof of love

My partner has SZ and has been diagnosed for thirty years.We have been together for two years.his twenty year marriage broke down…perhaps partly due to the difficulties I am experiencing with him.He seems to only feel loved if we have sex very often,every day really,and can sulk if I say I am too tired.It is causing distance and resentment between us and is making life unhappy.Has anyone experienced anything similar?