You had amnesia for a few hours because of a surgery you had.

The whole time you were flirting with the doctor. Making him chuckle once in a while.

The medications you took increased your confidence. So you just decided to tell him:

"I think you're pretty cute."

He looks at you then smiles.

"Yeah? Then good thing I'm dating you."

He said while leaning down to kiss your forehead.

In fact, it was actually your boyfriend. You just didn't know because you had amnesia.