Fujistu
1. Are you absolutely sure you had no bounty on you? Even 1 gold bounty is enough for your spouse to hate you.
2. You don't have any saves or auto-saves before this occurred?
3. You should be able to re-marry. If you're playing on the PC then there are console commands that you can use to revive Vilkas.
yeah, when he began attacking me I checked the crime tab and it showed no current bounty.
I do, but I'm too far past to go back.
I'm on Xbox. /: And I tried visiting the priest in Riften again but the option to talk about marriage didn't show.