Bitch man or trash man

I been suspected that my husband is been cheating.. For three weeks now since my sister visited me because she goes through rough divorce.. Today l went to work and l knock off early l was not feeling okay.. Guess what l found up when l come home l found my sister sleeping with my husband on my own bed.. I been cry to her that l suspect my husband is cheating but she act as she care to me.. What should l do.. Because l jst walk away and l know if l go home now l will found them home all of them.. Advice please