Many say that everything is different and very individual in relations between people but I bet as we are all living on this lovely planet and all called "humans" we are definitely have a lot in common grounds. I think in purchase of individuality we can lose the main meaning, so let me remember some important things quite vital to remember for everyone.
1) Avoid Looking for the perfect one as perfection is a relative thing and differs.
2) Avoid Loving your best friend... No comments just clear
3) Avoid Fighting for the person who can't love you back as this is non-sense at least and sometimes looks foolishly...
4) Avoid Giving everything to someone you're not sure of... Almost the same idea as previous.
5) Avoid Being too possessive
6) Avoid Playing with other's feelings 'cause this is cruel and really not good
7) Avoid Degrading yourself - the life worth living it in happiness and joy, no need to lay down.
8) Avoid Lacking of trust to your partner: this is kinda important