My best friend ignores my emails and won’t see me

I can’t understand if this is because she needs time or because of my own circumstances. My friend has recently moved in with her lesbian friend. They’ve been together since high school, and it was no secret to anyone. The three of us went to the same university, we’ve had the best time of our lives and went through thick and thin together. I’m heterosexual, but it never mattered, for it’s not our habit to discuss personal life. This summer, my friend had a terrible row with her parents, who are very religious and don’t accept anything that’s beyond their limited views. As a result of it, my friend left the house, she said it was once and for all. She cut off all contact, changed her phone number, and seemed depressed. I arrived to comfort her, but her girlfriend made me feel alienated. We were never close with her gf, my friend was the glue that held us three together. I guess, while they both were open with me and I was single, it made no difference to me. But I’m in my first relationship with a man now, and I was maybe too quick to share my joy with my friend that night when I was at her girlfriend’s house. Their reaction was bewilderment, and I thought I felt a tinge of reproach. Was it because it wasn’t the right time to talk about me? Or were they so used to me being single for decades that they could never imagine me with anyone? Or is it simply this difference between us that never mattered before, but suddenly matters now? I’ve called my friend many times since, and she told me that we should switch to exchanging emails for a while, for her “to see if we can take it further”. What? We spent years horsing around together, and now she can’t dare to see my face? I don’t want to lose her! Any ideas?