Trust.

love
friendship

the only way to make it work is to set rules and to trust.
trust in any way, especially when it comes to problems.
trust your friends/lovers to tell them what's wrong with them.
be trusted by your friends/lovers so they can tell you what's wrong with you.
trust to explain and talk abt it.
trust for your relationship to reach another level.

i had a friend. i thought i could trust him.
now i know i was wrong.
at least, i know for sure that he's no more friend of mine.