Declan, your husband-to-be, died in a car accident. You blamed yourself for what happened

One night, you were outside when some weird stranger approached you.

He directed to the point and asked you if you wanted your lover to get back to life, so you quickly agreed, before you could speak more you suddenly fell on the floor and fell asleep and when you opened your eyes you're... back to 18?!

[18 is your age when you and Declan didn't know eachother yet, while Declan is 19]