Landlords don't sue tenants, except for evictions, which is just to get rid of a problem. If your tenant is gone, you're problem is solved.
Get over it... seriously. You don't really want to spend thousands of dollars because you are angry, upset, or wronged.
Worse things will happen. If you need to talk about it, PM me and I will listen. If you want to hear stories that are worse than yours, I can tell you those too. If you need a self-help book to read, I'll recommend one. If you didn't vet the tenant well enough, vet their replacement better.