OP, she isn't gonna fourth text. If you want to provide additional content for our lulz, you're gonna have to toss out some bait to her. Something as simple as "just got back from vacation, didn't have service" would suffice. Explains why you didn't respond but doesn't give any details about your vacation or any response to what she actually said. She'll be wondering where you went, assume it was abroad, and wonder who you went abroad with. It'll eat her alive. As it is now she just thinks you're a beta who didn't respond because she's with another guy and that fact hurts your feelings and you're too immature to handle it.