https://soundcloud.com/stefan-iordanescu/we-shouldve-never-been-apart
 
The last production Garaboncias, recorded & mixed in SONAR X2. Any suggestion is welcome!

The thing that I notice (and this is coming from someone who can't sing and is a novice at best), the lyrics don't match the song. It appears words are forced or crowded in places. She would sound good holding and flowing some of the lyrics instead of trying to fit the words in, which makes her off key in places. Male voice is flat, but I couldn't do better. Are the lyrics set?
Now the recording, instruments and mix are very good, a catchy tune. Hopefully someone more talented people will chirp in. cap

I Liked it! Good mix and production and I liked the way the female and male vocal swapped words within the lines. I think it has the kind of appeal for the tween crowd, you know the kind of stuff they do on Saturday morning kids programming. Good job!

+1 to the above.   Musically it sounds pretty solid and suits the style IMO.  Nice guitar solo - short but effective. 
 
But the vocals do seem a bit "forced", or perhaps it's a language/enunciation thing.   There's also some (what sounds like) phasiness in some of the vocal lines, maybe from FX or tuning?    For the middle back and forth section, may I suggest holding the single male words longer underneath the female lines and perhaps with a harmony?  Could sound nice.