People come and go, and people can change at any moment. Remember that. Never get too comfortable with someone’s presence or promises, because the same person who means everything to you today might become a stranger tomorrow.
Don’t be consumed by materialism. The trouble is it's never enough. As a result, one can be easily controlled by those who are wealthy and have a lot to offer. Stop comparing yourself with others. Learn to be content and remember, material things will NOT make you content.