How can I respond to her?

Author's pov

"This isn't the way I wanted Danielle to find out about my new relationship with her friend," he thought as he stood in front of Danielle, sweating and still holding his phone.

Unbeknownst to Luke, Danielle didn't display any signs of anxiety. She was simply trying to quickly give the phone to Luke before the call would end and casually find out who was calling.

Luke couldn't say a word. Instead, he took the phone from her but didn't answer the call in her presence. He took the phone and went into the bathroom.

"Why can't he answer his call in front of me? What is he trying to hide?" she thought, but she had already made the greatest mistake of not properly checking who the caller was. She walked closer to the bathroom to see if Luke was carefully answering his call. She placed her ear close to the bathroom door and noticed that it was very quiet and Luke wasn't speaking to anybody.

"Hmmm... maybe it's just an ordinary call," she thought and returned to the bed,