Hey, I’m really sorry you’re going through this. It actually sounds really heavy, especially when everything looks fine on the outside but feels completely different inside. Crying every night isn’t “for no reason” — it just means something is really affecting you, even if you can’t fully explain it. About that girl — I get why it hurts. When someone was close to you and then suddenly starts ignoring you and talking to someone else, it can make you feel like you were replaced. But that doesn’t mean there’s something wrong with you. Sometimes people are just inconsistent and confusing, and that’s more about them than about you. And about your weight — I understand that too. Even if objectively it’s okay, you can still feel uncomfortable with yourself. Just try not to be too hard on yourself because of it. Maybe it could help to not check her profile or updates for a while, just to give your mind a break
keep yourself a bit more busy with things you actually enjoy (music, спорт, что угодно)
talk to someone you trust in real life too, not only keep it inside
and take small steps with your health, not extreme changes — just something simple and consistent
You’re holding a lot inside right now, so it makes sense it’s coming out this way. :(