I don’t know what’s going on

I don’t know if it’s school stress or maybe hormones but lately I haven’t felt genuinely happy. I feel like I’ve been acting and saying that I am because I have a boyfriend and they’re supposed to make you happy, right? We do have our great moments, but sometimes I’m doubting his fidelity and that makes me really I secure. I don’t want to tell him I’m insecure about anything because I don’t want to appear weak or I don’t want him to think I’m overreacting. There’s sometimes where I don’t really emotionally feel anything. But there’s also sometimes where I just feel sad and really irritated and over school and personal relationships. I don’t really know what’s going on or how to fix it.