ok someone in windhelm asked me if i was interrested . my awnser was yes.
But if i meet someone else that i like more can i switch.I didn't went to mara for the wedding is that person gonna want in a few days or does it fade away

You can switch your option by asking another person if he/she/it is intersted.To acivacte the weeding you must talk with the priest.If you talked with him and don't want to mary that ugly person wait for the ceremony than kill someone.The weeding will be canceled,homever you can try the ceremony more 1 time.

Yes I'm interested. Lets get married right now.

hahaha lets get married yes