Constelație translates to "constellation". It's a beautiful and somewhat rare word to find in everyday song lyrics, making it stand out.
In the song, the lyric "Îi lipsea o stea din constelație, i-am pus alta" (She was missing a star from her constellation, I put another one in) uses the word metaphorically. It suggests that the person was incomplete or lacking something vital, and the singer stepped in to fill that void, restoring her completeness and brilliance. This poetic imagery makes the word particularly enticing.
This song is one of the most satisfying 'thank you' notes you'll ever hear. Liviu Teodorescu isn't thanking a lover or a friend, he's sarcastically thanking his girlfriend's ex. The chorus is a direct message to this other guy: "Ție vreau să-ți mulțumesc / Că n-ai știut s-o iubești" (I want to thank you / Because you didn't know how to love her). It's a bold move, and he spends the whole song explaining why the ex's failure was his good fortune.
He describes how he found this woman broken by her last relationship and carefully put her back together. He claims he "Am reparat tot ce-ai stricat" (I fixed everything you broke), turning her life from ruins into a castle. He sees himself as the hero who performed a miracle with a little love and affection, because as he says, "miracolele / Se fac cu dragoste" (miracles / Are made with love). Now, they are blissfully happy, and she's finally in good hands.