Take pictures and document her craziness!

Police involvement, lawsuit, restraining order.

She probably did that three years ago since it was your spare tire. In which case I don't think the police will do much about it sorry OP

I'm confused: Is this a psycho-ex from 3 years ago just popped up and slashed a tire recently? if so definitely FYL BUT If this is the psycho-ex slashed the tire 3 years ago maybe during the breakup & OP didn't check his spare in 3 years major YDI.

sue the living daylights out of her. Her lawyers won't even know what hit them.

Why did it take you three years to find this? You should check tire pressure of your spare as regular as the normal tires. If the spare doesn't work when you're in a bind, you're screwed.

That's why you always check it just Incase make it part of your routine

That one is kind of on both of you op... It's your job to check these things routinely, and apparently it's her job to be a sneaky bitch.

If you haven't checked your spare in at least three years, chances are it wouldn't have done you much good even if she hadn't sabotaged it.

Ever heard the sayings women hold grudges and hell hath no fury over a woman's scorn, neither of those lie....