Will God answer the prayer of one who hopes for his wife's return, helps those in need, gives charity, and maintains his prayers, despite repeatedly falling into sins and repenting from them?

Allah is All-Knowing, All-Capable, and Most Merciful concerning all things, so continue supplicating to Him and do not despair of His mercy. Repent to Him with sincere repentance, strive in His obedience, be content with what He decrees for you, continue to do good, and do not abandon supplication or be hasty. Do not tire of repentance no matter how often you commit sin, for Allah is Oft-Forgiving, Most Merciful, who accepts the repentance of His servants and pardons evil deeds.