How can you respect your own boundaries and self-love when someone you care about doesn't see a future with you?

Why do you think a girl would keep following and unfollowing my boyfriend on Instagram? Then he likes and unlikes her photos and just now he started following her. It’s been going on for months now.
What are some inspiring stories of teachers who have made a huge difference in their students' lives, particularly for challenging exams?
Why do some people enjoy moving to new places despite the challenges, and how can that adaptability be developed?