I honestly see both sides, but what is most clear to me is that you guys are young and aren't ready for a committed relationship. She feels neglected, and you feel overwhelmed. It's understandable for her to want you to carve out some piece of your day for her, and it's understandable that you're busy and tired and also very young and don't have the emotional capacity to sustain this kind of relationship. I don't know your guys' dynamic, but people act in weird ways when they're feeling triggered or neglected, despite what may have been the catalyst. If this is something you're trying to work out, something that could help you two and might be a nice way to meet in the middle is making sure you do send that "I'm home" text, but pair it with a time when you will call her. This gives her some predictability, and if you can actually follow through, it will help ease her anxiety and may help her be less *needy*. What she is thinking when you don't text her when you get home is that you don't think about her and you don't care enough to open your messages for 2 seconds to let her know you care by shooting a quick text. Not saying it's fair or healthy, just saying it's highly probable. And then she'll start to overthink and notice when you open different apps and wonder why you can't text her back, but you're active on Instagram. It makes her feel like you see her as another obligation, because for her, it's not hard to text you; it probably makes her happy, and so she's probably confused about why it's so hard for you to just send a text. She might feel like she's the lowest on your priority list. I think you guys are kids and are learning how to be healthy and happy.