Flattery does not encourage the perfect flow of love in the vein of your relationship. Be genuine and speak out what you feel for each other without hiding the painful truth.
Just as some people may conceal their own sinfulness thus seeming better than the norm, others expose their own sinfulness thus seeming worse than the norm.
Do not rush to judge someone unless his/her fruits reveal the truth. However, don't forget; mostly, it's not the fault of the tree to produce bitter fruits. Sometimes, the soil determines that; blame the source! Deal with the soil! Don't deal with the tree! Other trees are there that the same soil can influence! Don't deal with your enemy, deal with the satan that sponsors them!
Thoughts don't become things; thoughts ARE things.
The only ethical principle which has made science possible is that the truth shall be told all the time. If we do not penalize false statements made in error, we open up the way for false statements by intention. And a false statement of fact, made deliberately, is the most serious crime a scientist can commit.