If you want to marry anyone else, you’ll need to be playing on PC and use a mod or console commands. After the wedding, your spouse will make you a daily homecooked meal (yes, the men of Skyrim will cook), live in your home if asked or you can move in with them wherever they live...
From UESP wiki, "Skyrim - Marriage" article: Steps to re-marry / divorce using console commands (PC only): Select spouse. Enter the following console commands: Removefac 51596. Player.removefac C6472.
Open the command console. Type resetquest RelationshipMarriage. Drop the Amulet of Mara from your inventory.
Console Commands are a debugging tool available to PC players, adding a wide range of functionality to the game. On American English keyboards, the tilde key (~) will toggle the console screen, but on British English keyboards, that key is the grave key ( ` ).
There's nothing quite like accessing the console to remind you that you're a PC gamer. It makes me feel like a man. Except when I press ` accidentally and end up typing something like wwwwdwwwwddwdwdwdwwwdwwwwdws.
If the console command has an (alias), it can be used in place of the longer console command.
The console in Skyrim can be accessed in-game by pressing the ’tilde key’, can be found near the “1” key on most keyboards.
MAKE FOLLOWER or SPOUSE FROM ANYONE. INSTALLATION AND USING: 1) Copy .txt files
Talking animals in skyrim? More messing with console commands!
Skyrim Cheats and Console Commands. Published November 2, 2014 | By Myrddin. Awww … so tempting. Usually I start cheating in a game after I played it through, just to find out how the game is with a maxed out character.