I think hubby is Cheating !!!

Lastnight Hubby And I were Having sex when He Pulled out A Condom ( We NEVER Use Condoms ) Also We Didnt Have Sex In about 3 days Before that && Lately Hes Been Acting Messed Up towards me . We Dont even Talk To each other nomore With Out him Putting me Down . . He Didnt started Acting Weird Like this After he Walked to Me And Whispered in my Ear " Hahaha Ur Pregnant " ( Im Not pregnant ) . i responded " No Im Not " He was Like " okay Well See " . Then he walked aways And since then Hes been out More , Comes In Late , Calls Me ( Bitxhes) . what should i do ?