ANSWER:
Such feelings are inflicted from Shaytan who wants you to go into haram again and you must fight and ignore this. You must repent to Allah while showing deep remorse and sincerity as premarital relationships are haram in Islam!
You must be grateful for what Allah chose for you. Being ungrateful for what you have could cause Allah to take away the blessings you do have as a punishment and end up with neither one of them!