Being vulnerable can seem like somewhat of a weakness to some people but in any real relationship vulnerability is needed to strengthen the bond forged between two people. As you begin to dive into those deeper emotions you begin to find and hopefully accept each others authentic *self*.
Like peering through glass, our true selves can only be seen if we allow it. And only then can ones true beauty be realized.
There are indeed two sides to every emotion. If you reward your lovers positive attitude with gratitude, they will present that same feeling again to you (and if they don't they are definitely not the *one*). Showing others who one really is without exaggeration or deception is paramount in any good relationship.
People like this will slowly drain you of the energy it takes to make a relationship work, (and lord knows it takes a lot of time and effort to make them work) its just not possible for a relationship to be in a good place if the significant other is constantly draining you with issues and constant complaints, fact is this type of lover won't stop until you and the relationship have completely run dry. Never give people permission to suck you dry, make it known that such actions are unacceptable and you will not stand for it.
Who couldn't use a well placed compliment? Compliments often make your partner feel good and everyone loves to feel good, plus it shows that you care (caring is a good thing!). Keep it genuine and never be afraid to speak from the heart. Love is a genuine compliment.