Does a love relationship with a girl, without a legal contract (marriage) or future engagement, render the Ramadan fast unacceptable or break the fast of the one fasting?

The love relationship mentioned does not break the fast of the fasting person unless it leads to the emission of semen. However, it is forbidden and a sin, and its sin is greater in Ramadan. It diminishes the reward of fasting or completely removes it, based on the Prophet's (peace be upon him) saying: "Whoever does not abandon false speech and acting upon it, Allah has no need for him to abandon his food and drink." Therefore, engaging in forbidden acts during fasting renders it fruitless and without reward, because the purpose of fasting is to subdue desires and achieve piety. Otherwise, it will not be looked upon with acceptance, and the fasting person's share from it will be nothing but hunger and thirst.