HUGE Pet Peeve

Ok so I have this friend. Her and her fiancé have been dating for only 6 months AND they're already engaged and trying. She constantly tells me how much she loves him but last night she asked me to lie to him about where she was. She always says she's 100% honest with him and always tells him everything. Yet she wanted me to lie for her. I think he's a bit controlling too. He gets mad over the dumbest things too. This is not my relationship so clearly I don't want to have to deal with it 🙄🙄