Eva Mendes and Ryan Gosling are ''very much in love'' and the actress believes it's her good relationship with her boyfriend's mother which helps their lasting love.
The 'Place Beyond The Pines' stars have been dating for over a year and although they haven't moved in together yet, they are crazy about each other.
A source said: ''They don't shout from the rooftops but they cherish what they have. There's no rush to move in together. What's his is hers already and likewise.''
Eva, 39, has also told friends her close relationship with 32-year-old Ryan's mother Donna is the key to their lasting love.
The insider added to Us Weekly: ''Eva says that's what sealed the deal with Ryan. They're going to make it.''
The brunette beauty recently admitted to hating filming sex scenes for her films, but felt more comfortable with Ryan as he made her feel better.
She said: ''Love scenes are awful. Let's just say that. They're always awkward.
''[Ryan and I] knew each other for years before filming. You can be friends with someone and not like how they work but I respect him so much. He certainly upped my game.''