Oh, come one. Seriously!? After the way that he treated you changed so much? After he had shown so much care, consideration, dedication, passion and, yes, love? There is no way that the MC thinks that Alphonse hasn't developed, and continue to develope, feelings for her. And of course Alphonse won't tell her that he loves her. Like, truly loves her, not just a cordial relationship by a contract.
The author is treading thing ice here. This is the kind of forced drama that has make me drop so many similar manga before. I'll wait a little more to see how this unfold.