Since he is not a tenant, but rather a guest, you do not need to evict him. If he will not leave after your repeated demands, you can have him arrested for trespassing.
THESE COMMENTS ARE NOT LEGAL ADVICE. They are provided for informational purposes only. Actual legal advice can only be provided after consultation by an attorney licensed in your jurisdiction. Answering this question does not create an attorney-client relationship or otherwise require further consultation.