so overall my game is playing great, no real problems or major glitches... however-my female sim has the soulmate aspiration. I've completed the first two sections of it, and am now on the 3rd part. ...
I am having the same problem. While I doubt that its impossible. I would definitely say its broken to some degree. I did as others said, made the opposite spouse mad through conversations with other random sims and done one mean interaction with the sim trying to achieve the goal. I don't know if it was because the spouse sim was VERY angry or if it simply did not work. I will have to keep trying.