Unfortunately, no, you can only marry once (as of now, wouldn't be surprised if they changed this in a patch since everyone is complaining). If you have a PC you can re-marry using the console commands.You can "get rid of her" by killing her, if you wish. But again, you only can marry one time, even if your spouse dies. Forever alone.If you want some related information, you should check out our guide to Skyrim marriage.______You should also consider creating an account here; it comes with several benefits and will also make it easier to post questions and answers. It's completely free!