Do you do the same thing as me, and make them a household from the start?
I have couples I play in eight of my save files who were started like this. Two couples were started as a married pair with kids already existing. The rest were started as a single sim that I eventually decided to make a partner for and added them into the household. Only one of those "add in to the household later" pairs has gotten married so far and two more have gotten engaged.
Do you create your potential love interest and have them move into their own home? If so, how do you get them to eventually meet?
I only have one save file where I am doing it this way. But there are a lot of couples and I play rotationally in that save. I forced the meetings either with the club system or by temporarily moving a sim in just to have them meet and become a couple and then moving one sim back out.
Do you let the game determine who your sim will fall in love with?
I have three save files where this has happened. In two of those, the couple is still a couple. In one, the couple broke up and my sim is currently single again. In all three of these games, I wasn't necessarily intending the sim to be romantic with anyone. It was just a go with the flow thing.
Other
I have six save files in which my sims aren't romantically involved with anyone at this time and I don't necessarily have any particular plans for romance. Any one of these could end up going the direction of any of the above depending on my own whims, or they could remain single forever. I play with aging turned off, so "forever" can be a pretty long time. :lol: