He lied (updated)

My marriage has been perfect, no issues, we don't fight...we have a beautiful baby together...today I was playing around on Facebook and realized you can view people's life events in their about me section. I went to my husbands and found out he had been engaged two years before he met me....I had asked him if he's ever been engaged or married and he told me no...he's still friend with the girl and I looked at her Facebook, they obviously had been together for at least 6months and got engaged...I was at work so I sent him a text asking about it and he denied it up and down.....I sent him screenshots of statuses he posted about her and he just said she was a fuck buddy and that the engagement and such was all fake.....I told him I just want him to be honest with me and he said he was...I asked if he wouldn't mind deleting her and he said he does mind and won't....even though we agreed not to have ex's on Facebook or in our lives.....we are both at home but haven't spoken a word to each other since noon and it's almost 5....im feeling really hurt that he lied, is refusing to tell the truth and doesn't want to delete her