Failed relationships can be painful or distressing, but it is important to remember that a failed relationship can be a stepping stone to a better future. A relationship may fail for a wide variety of reasons, and sometimes two people just grow apart and no longer want the same things from life. If you have a failed relationship then you should pick up the pieces and move forward instead of obsessing over it.
Don't hurt the next one because of pain from the last one! Let God heal you.
Don't ask God to remove people when he has given you the power to say goodbye.
Some people will never understand the sacrifices you're making for them.
When you get taken for granted, don't change who you are. Just change who has access to who you are.