Help the hurt

Britt • Recently married. Pup mom to a silly terrier. Step mom to 3 kids... Trying to figure out my life; and to please God
So my husband went to jail because of me because he bruised me... Or fight was because he was going sleep with another woman- and he did... Behind my back. We tried for the five months he was in jail to protect and save our marriage.... I paid for a vacation with him this past weekend- and we went- then I find out he cheated while married, doesn't love me, and wants a divorce.... 
So why does the hurt sting sooo much? Obviously this guy isn't right for me. Why do I feel so broken, unworthy, and useless. ?