The end of last season Fitz professed his love for Simmons, and she didn’t really see it coming and didn’t feel the same in that moment. That’s something that once that moment’s happened, you can’t really go back from that in a friendship. You have to move forward, and we see how they deal with that. That moment changes them both because it was a life-threatening moment, and neither of them will be the same after going through that emotionally and physically. It was a bomb that went off, and now they have to find a way to recover.