We were an item. It's... Not a life I remember with full clarity, but I don't believe the relationship was entirely consensual. Neither of is particularly proud of the choices our alternate selves made. [It's like his mouth is moving without permission from the rest of him. He hasn't even talked to Jemma about this.]

It could be part of the transitional process. There's most likely variance between our worlds, but in my experience, powered people undergo a drastic shift in DNA when their abilities are triggered. It isn't unrealistic to imagine that brain chemistry may be altered, particularly given a dramatic swing in temperature.