I'm an Aromantic, and I know next to nothing about relationships or anything like that, but I do know something about writing, being a writer myself, and here's my best judge of where this is going:
The writers want a little drama to spice up their show, but they couldn't think of a good way to work it in without someone acting OOC, so that's exactly what they did. They just want a setup for some nice drama, and that comes at the cost of the MC's integrity as a character.
Of course, they still want a happy ending and all that, so it's possible they'll have him be '"the one", and they get together at the end because he's a "changed man" and "isn't the power of so beautiful?"
This is a writing practice I personally find deplorable, but that's just my own personal opinion.