Wife no longer in love with me

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The hardest thing is to detach. My life is pretty miserable without her. All my friends are married and now having babies, so it is so hard to see that as we were supposed to do that this year. Plus, my friends are all so busy with their wives and babies that there is no longer a social scene I can be part of. It is so lonely now, and I feel so empty without her.
We have had weeks where we haven't seen each other or hardly spoken, up to 3 or 4. I'm not sure if that is considered long enough, but last time we had that sort of break she then came to me with a letter from a lawyer.
But each time we have spoken during a "break" I have always told her I loved her. Until the lawyers got involved, she would always say she loved me back, but I guess in hindsight now that was rubbish.
I think the acting happy 180 is probably the best I can do, as every time I see or speak to her I'm miserable and down and asking her to reconsider. I am just scared that if I start acting like that, then she will be getting what she wants, as she keeps saying "we both need to move on, it's not healthy for us"

I just never want to give up on us, as I see so much good and nothing that can't be repaired. However she just reflects on any tough times and has blocked out anything good.
She also has a couple of friends who I feel are very influential. One is divorced, husband left her and kids for a younger woman, the other has left her husband too.