Goethe on Romantic Love

I read some time back, Faust - First Part. Clearly, Goethe understood very well that even an elderly, learned and wise man like Faust is not immune to the effects of this phenomenon called romantic love.

On seeing Gretchen and thereafter, her room, when Mephistopheles secrets him into it, Faust waxes eloquent on his feelings. He says,

"Grip my heart, O keen edged lover's pain, that languishes on mere dewdrops of a hope.
...
How deeply you are stirred! Your heart is heavy, and you feel so out of place. Wretched Faust! Who are you anyway?"

Goethe, here has a wicked sense of humour. For Mephistopheles tells Faust, "May I advise Your Lustfulness..." Gretchen is expected back any moment and Mephistopheles tries to hurry Faust out when he addresses Faust thus.

There are people who believe in love at first sight. I myself am a romantic. While I agree romantic love is tinged with lust, it is not all lust as some would claim it to be. I wonder if Goethe had similar feelings for some girl or if he heard one of his friends speak as Faust did. Whatever it may be, I think Goethe must have been a brat with a very good sense of humour.