Edward was not too happy about it of course. Later, everything unfolded, she found out the truth, and it was horrendous. She did not know that she was pregnant then, and all that happened got her a miscarriage. Edward did feel some guilt but ultimately still chose Floresca who was also pregnant. She wanted to go back to Alighieri, but who was she kidding? It's not like her parents will welcome her with open arms, also why would she let them get their happily ever after?
She knew that Edward wanted to but could not divorce her that easily. First, he has no valid reason as she gave birth to a prince already. The marriage has been consummated, and she has provided him with a male heir. So, if he still insists on doing so, conflicts may arise within the allied nations, something they cannot afford after the war with Jinjoo.