The French singer-and-actress and the actor separated last June after 14 years together and Johnny is now in a relationship with Amber Heard - who he starred with in 'The Rum Diary'.
Vanessa - who has two children, Lily-Rose, 13 and Jack, 11, with the Hollywood heartthrob - has accepted their romance ran its course and insists love is an ever evolving emotion.
Speaking to the new German issue of Grazia magazine, she said: ''We're changing all the time. Once we want to fight for our love, once we want to get rid of it. Sometimes we're happy without love, sometimes not. Love doesn't necessarily stay what it is.''
Vanessa has a very philosophical view of romance and insists love will find everyone in its own way at some point in their life.
The 40-year-old beauty - who is releasing new album 'Love Songs' - explained: ''A relationship means something different to everybody and love can't be locked up. Love means freedom and in freedom everything is permitted.''
Vanessa's LP contains the track 'New Year' which was co-written by her, Johnny - who plays guitar - and their daughter Lily-Rose came up with the singing melody when she was ''very young''.
Johnny, 49, and Amber's relationship is believed to be getting serious and recent reports claimed the actor is even considering marrying the 27-year-old blonde - who is openly bisexual.