Problem

My Sim just got married but I did not get a window to move them in with each other. Because of this my Sim is still living alone.
Getting married under the wedding arch resets my Sim. He is married though
My Sim got married but still has the same name he had before.

Cause

EA added code for a wedding anniversary which you only get with Seasons installed so if you don’t have the EP, this fails.

Since the Sims are married, you can move in the Sim manually.

Use the Move In option on the friendly menu.
Use Edit Town to merge the wedded couple
Use the Cheat testingcheatsenabled true, shift-click on the lot and choose Add to household

The name of your sim can be changed on the city hall

The reset itself should not be a problem

This error should be corrected once you install Seasons