My husband and I are recently seperated, and hes seeing someone new?

So my husband was on vacation about a month ago, and met someone back home. I found out and made him move out. He has been seeing this girl for about a month. we live in VA and she lives in VT they have hung out like twice, and they are already saying I love you to eachother. I am devestated, as we have been together for 5 years and have a son together. how can he tell this girl he loves her? they barely know eachother. How can i get over this and stop crying? He left today for a seven month deployment so that will help me get over him.