What subtle green flags show someone is a keeper, and which red flags are real dealbreakers?

Hey everyone. I'm a 19-year-old guy. I grew up in a house full of brothers, so I feel like I'm learning about women from scratch.

I've been in a long-distance relationship with my girlfriend (18F) for about a year. I've tried to be a good partner—supporting her emotionally through family drama, planning a future together, and being consistent. But lately, I've noticed some changes that have me confused. Small things: she removed me as a follower, changed our shared profile picture, and seems "busy" or "sleeping" while I can see she's active online at 3 AM her time.

I'm not here to ask if she's cheating. I'm here because I realize I don't have a strong internal compass for what's normal and what's a warning sign.

From your experience, what are the subtle green flags that actually mean someone is a keeper? And what are the subtle red flags that you now know should never be ignored?

I'd be grateful for any wisdom you can share. Even a single sentence could help me see things clearer.

(شكراً مقدماً لأي نصيحة. أنا عربي وبقدر أي مساعدة.)
What subtle green flags show someone is a keeper, and which red flags are real dealbreakers?
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