What would u guys do??

My husband and I were separated for couple years. We have been back together for a year and a half. Well while we were separated he dated a couple Asians. Well every time we go to stores I notice he looks at Asians women. Well it just dawned on me his secretary is a little Asian girl. So I looked her up on Facebook and she has pics of her in a Bra and panties partying in Las Vegas!!! This girl works very close with my husband all day everyday. They carpool together do lunches. And then this morning she texts him she needs help carrying stuff at work if he could help her cuz they are carpooling today. I'm very upset about this. I told my husband to hire a professional person or I will report her to his work! He said if I do that he is leaving me for messing with his work!!!! Shouldn't he replace this slut with a professional????