Can you sue your live in boyfriend for abandonment?

For the most accurate legal advice pertinent to your particular situation and jurisdiction, you should consult a qualified lawyer in your area, which I am not.

Abandonment is a term used in family law addressing changes to legally recognized relationships between married individuals, and between parents and children. A live-in boyfriend may owe you for rent or utilities if he was party to a contract with you or the landlord/utility companies, but that would be it.