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

2. Your Sim blushes when receiving a किस from the Sim they are in प्यार with.

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

4. Your Sim always hangs out at their place.

Do they प्यार me back?

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

6. That Sim gives आप 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 शामिल होइए her. With GB and Sam it's always séance cuz they're spooky)

8. They शामिल होइए आप when you're in the fountain.

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