If you don't love the person, don't show that you have a motive just so he/she would love you back.
Everybody would take love seriously if they are hit hard. It's just that not all are strong enough to resist temptation.
Use your heart to care for a person whose closest to you. Use your brain to take care of yourself.
Don't let go of the thing that you can't bear to see being held by another.
Don't possess that thing which you know you would let go eventually.
Never ever possess another thing if you know you already possess something.
It's just like taking the elevator. Why would you cram yourself in if you know that there is no more room for you. There's always the stairs, you just don't want to acknowledge it.
If you wait for someone to flirt with you, nothing will actually happen in your life...You must also initiate the flirting. (or something like that ^-^)
If you love someone and he/she doesn't, just let it be. Who knows in the following days you'd come to not like him/her anymore. It's just a matter of who goes first. (d'you get it?)
Leave the relationship if you are not happy anymore. There's no cure for stupidity but initiative.
If your loved-one doesn't love you, don't complain. You see, there are also people you don't love but love you...so call it even.