All right, so I was playing MySims, and my Sim, Sam (She is goth), seems to be in Liebe with Goth Boy! So let's start-
1. Whenever Du hit "Be Nice", your Sim either blows a KISS oder gives a hug to the Sim Du want to be nice to.

2. Your Sim blushes when receiving a KISS from the Sim they are in Liebe with.

3. Your Sim always encounters them when they are outside.

4. Your Sim always hangs out at their place.

Do they Liebe me back?

5. That Sim blushes upon receiving a KISS from your Sim.

6. That Sim gives Du a lot of hugs and kisses.

7. That Sim wants to be in whatever your doing. (For example, if Mary, my friend's Sim and possibly Travis' crush, was having a dance-off, and Travis, Mary's crush, came along, he will Mitmachen her. With GB and Sam it's always séance cuz they're spooky)

8. They Mitmachen Du when you're in the fountain.

9. They hang out around your house and/or workshop.