How can I move on from these toxic relationships?

METALHEADi
there's a lot of details feel free to ask and I will answer. I was in a relationship with one with me at work. it was ok but she did me all wrong and I was in love with her. she didn't care for me. And I was trying all I could to reach her but broke up with me after trying to face her with what I felt to try to fix things between us. she said everything heavy like "I will not love the way I loved me ex" so my best friend"working with me" stepped up to try to fix things between us.. so he talked to her and the Friendship between improved the I didn't see it until early because I found out lot of betray. So they were hanging out together and my best friend was saying he was only trying to fix things between us.. because I was hurting so bad because I loved her. So I found out they hangout together a lot without my best friend telling me even though I found out she went to his home and I asked them and they lied about it. So I told my friend do u have a feeling for her because u r my friend and I don't want to lose u. He said no in same time she called him asking him how he is doing and asked if he ate well or not. so when I heard it he panicked and hung on her.. so next day I ask her if she want fix things between us.. she told me she didn't even loved after faking it for 4 month even I tried to ask her parents to get engaged. Even she told me friends at work and supervisors that I was trying to hook up only. Since it my Best friend didn't call me and I found out they both lied to me from our friends at work and even they didn't tell me everything to not hurt me feeling.. I lost one that I loved and she faked it and I lost my best friend. So I am all alone now I can't move on and they are working with and even worse that talking behind my back worst things.. but all my friends in work even the supervisors knows what happened and they pity me because they know things and wouldn't tell me about it to not hurt my feeling.. so what I should do to move on?
How can I move on from these toxic relationships?
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