You do you. You're entitled to your feelings. I see it very different.
It's not cheating if you're separated. You're either all in or all out with me. no half assing it. If you're separated that means no sex, no going out on dates, no talking about your day, no entertaining guests, no living together, none of the things that are integral to a marriage, but somehow she wanted fidelity. She can't have her cake and eat it too.
I don't doubt she loves the Mc in her own way and there things that are likable about her but she comes across as controlling to me.