out of the picture: o que isso significa?

Since your friend started dating this guy, she hasn't had the opportunity or permission to hang out with you anymore. One day, you find out they split up and you can't help but feel happy for that. With his boyfriend out of the picture now, you'll finally be able to compensate all that time she was too busy doing whatever her boyfriend wanted. 

When something or someone is out of the picture, it means they're irrelevant, they don't count anymore. Just like your friend's boyfriend that will no longer get in the way of your friendship, anything that's out of the picture will be like dead or departed. That's the expression of today. Take care!