No probably not but i have not experienced it before
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If your getting married to a neighbor, You can propose engagement and then propose the marriage.
There is no way to get married in the sims 2 for the PSP.
you see the relationship bar down the bottem that has to be around 100 100 with a heart there when you talk to the sim there should be a little thing that says propose... click on that and then it should say MOVE IN GIVE PET or PROPOSE so yer click propose but if you wont the guy to propose you have to ask him to move in and then propose but if you wont to do things more fancy you can ask them out on a date to tea and when you both are sitting down it will say something like PROPOSE or SURPRISE PROPOSE
Once they have been in love long enough, the option to 'propose' should pop up in the socializing list. It has to be a Sim you can control.
you need to keep using a lot of romantic interactions. eventually you will have the option to propose to your sim.