I am willing to accept Monica's version of the truth... for now, and I can believe her cuck of a husband would still take her back and beg her not to leave him or see the MC anymore, sadly I can also believe that while she is very much in love with the MC and always will be, the part of her that attracted her to her husband is still there and she still has feelings for him. She said it herself, he's not a bad man... just very boring and predictable.
That said, she will need to choose what kind of woman she wants to be and who she wants to share her life with. As much as the MC still has feelings for her, he's not exactly lacking for potential options... and if she doesn't want history to repeat itself, she is risking this golden opportunity for a second chance with the love of her life, her soulmate... just to not break the heart of a man who will never compare with the MC.
I'm willing to give her some time and space to figure out what exactly she wants, before the MC giving her an ultimatum.