How do you get a sim to love you on sims

The lifetime and daily relationship meters both need to be high with the Sim you want to fall in love with your Sim. You can raise both over time through social interactions or just by talking to that Sim. Use the flirtatious social actions as they become available with that Sim, such as flirting, whistling, hugging, kissing, and so forth. Eventually you will see little pink hearts floating on top of the other Sims' head when they have a crush on yours. More flirtatious interactions, such as make out and romantic hugs, will make red hearts float above that Sims head when they fall in love with your Sim.