Should a boyfriend propose to the girl he loves and wake her for Fajr prayer, or should he leave her due to his current inability to afford the expenses of marriage?

The young man must repent to Allah and cut off his relationship with the girl, whether he intends to marry or not; because Satan gradually entices the servant. If he resolves to marry and can afford it, let him proceed, otherwise, he must fast, for it is a deterrent to lust.