It is harmful to eat if you are not hungry. it is even worse to have sex if you lack desire. But even more harmful is to try to think when you do not wish to, or to be engaged in meaningless intellectual activity. Many people do so when they want to improve their position.
The thing is that love gives us a ringside seat on somebody else's flaws, so of course you're gonna spot some things that kinda need to be mentioned. But often the romantic view is to say, 'If you loved me, you wouldn't criticise me.' Actually, true love is often about trying to teach someone how to be the best version of themselves.