Does feeling at ease after supplicating to Allah for marriage to a specific person indicate that the supplication has been answered?

It cannot be definitively stated that psychological comfort after supplication is a sign of its acceptance; this belongs to the unseen, known only to Allah. However, optimism and good thoughts about Allah are encouraged. If this person is pleasing in their religion and character, there is no impediment to seeking marriage with them, whether by directly proposing or through a trustworthy intermediary, provided that their agreement is highly probable. If marriage does not materialize, then one must forget them and ask Allah to grant you someone better.