Infidelity 

My husband and I have been together 13 years. About 3 nights ago he came to me and told me my best friend had been asking him to hook up . The next night he tells me that 6 months ago when my friend spent the night because we had all been drinking. That they messed around and even flirted for the following week. He didn’t care what I said to the first friend however he continued to try to protect the other one. He didn’t want me to confront her he just wanted me to forget and move on. Ofcourse I couldn’t so I did confront her which she denied it all. My husband was so mad at me for doing that. Remember they both faced me so many times knowing what they had done. So can anyone give me some advice??