Since that's his own concern, we better not interfere.

He should stop his selfish behavior.

It's important to believe in yourself.

She is planning a date with her current boyfriend.

He lost everything.

My boyfriend gave me a gift.

Everyone was surprised by the news.

Believing that failure is a stepping stone to success, he challenged again.

Believing that failure leads to success, he continued to challenge himself over and over again.

He starts talking about himself at every opportunity, causing trouble for the people around him.