Marriage vs friendship?? My own husband choose friendship than his marriage. Pls help me!!?

It started when my husband promised to get a misuse for me. He said his bestfriend is a pro n he trust him. The next day, his bestfriend called me. He said he took my number from my hubby w out him knowing. My husband & I are very open minded people. He also introduced me to fetish lifestyle but we are not swingers. His bestfriend told me his into d lifestyle as well and started asking personal questions Which I didn't mind answering. Then he started to hit on me though I was still nice, I never said I agree and kept telling him I cannot cheat on my hubby. It happend for days before he stopped. I tried to tell my husband he was texting but he seemed not interested so I decided not to tell him in details. After 2 weeks, me & my husband were arguing on d phone regarding trust. I could not help it but to tell him about his bestfriend. His reaction was, y would he do that?? When did this happen? U are lying bec he can't do that to me. After an hour, my hubby and beatfriend called me. They both were cursing at me and called me a dirty whore. My hubby said he have copy of those texts but I told him I have too and maybe what he have was edited. My husband defended his friend & got so mad at me. My mistake is I kept quiet n waited 2 weeks before I told him. We have small kids and now he left d house & refuse to talk to me even when it's bout d bills n d kids. I'm so mad at his bestfriend! Even I have my faults, I am so hurt how my husband handled d situation. I am his wife & w out a doubt believed his friend over me. I don't know what to do u my marriage, bills n kids. He refuse to talk to me. Is it really my fault? What should I do?? Pls help!