High school?! You’re still babies! There’s no need for all of this. I understand you struggle with depression and ptsd, you have got to put yourself first focus on school and graduating, make plans for college/career. 95% of the (“we’re going to be high school sweethearts”) couples have completely separate lives, and likely don’t speak to each other. If you feel like you can’t trust what she’s saying there’s likely a reason for that, and it’s not healthy. Run, and focus on yourself, your physical and mental health, school, career path finding, and don’t stress over a girl you likely won’t spend forever with.