What is the ruling on feeling attached to a young man after the relationship and commitment have ended, and what is the solution to get rid of this feeling?

Congratulations on your repentance and steadfastness, and we advise you on the means of remaining firm. If what you feel is merely a thought, then there is no blame. The best cure for love is marriage. If your marriage to this righteous young man is possible, then that is good. If not, then strive to forget him to avoid what is unlawful, and remember that not marrying might be a pure good that Allah has diverted from you.