How do you deal with an unsupportive best friend? Can someone help please

So. My boyfriend and I have been together for two years. I found out 6 months ago that he cheated on me the first month of our relationship. Him and I decided to work it out since we live together. We have been rebuilding trust and doing amazing. He shows me everyday how sorry he is and proves his trust to me. It’s not 100% there yet but I do believe he will not do this again. We do attend therapy together and separately also. Anyways, we are purchasing our first home together and I told my best friend. She is extremely unsupportive and I don’t know what to do. She tells me that if I continue living with this man that means I have 0 respect for myself and she will not have any respect for me since I don’t have any for myself. She tells me how much she absolutely hates him constantly. I get it because if it was my friend I’d be so upset also but I would be supportive of her no matter what. It’s just hard to see her when she just puts down anything positive he does or we do together. I don’t know what to do. She says no matter what happens she will never support me being with him. It’s just so hard to move forward when all she wants to do is constantly remind me of what happened and bring it up almost like she is throwing it in my face non stop.