Lily Collins says ''people come into your life for different reasons''.

The 'Mortal Instruments: City of Bones' actress and her co-star Jamie Campbell Bower - who had been dating for over a year - recently called time on their romance and in an interview conducted before the split was confirmed, Lily, 24, admitted not all relationships are built to last.

She told Teen.com: ''It takes being a really strong person to take care of yourself before you can take care of somebody else. I think you could learn so much from somebody else, but at the end of the day, you really have to feel comfortable within yourself in order to give yourself to someone else. You may find that with one person - you may learn different things about yourself from different people - and everybody that comes into your life comes into it for different reasons whether it's to teach you something, or for you to stay with that person. So I think it's all about, again, not that being open for new experiences, but it's being open to learning new things in a relationship about yourself.''

Despite the split, Lily insists she can't wait to return to shoot the sequel 'Mortal Instruments: City of Ashes' with Jamie and their co-stars including Robert Sheehan, Kevin Zegers and Jemima West.

She said: ''Robbie's just hilarious. Like, he's Irish and he just has this, like, very European, funny nature to him. When he came in, right away, we clicked as best friends. He's so easy to get along with - it's very hard not to get along with Robbie. Kevin, he and Jamie have the perfect dynamic because they're catty toward each other, but they're also - they have fun with each other. We all on set were a family. We all struggled together; we all sweat together; in training, we all fought together. And Kevin has become literally like family to me, protecting me on set, but then off set becoming so close with [him] and his wife. And Jemima jumped right in there, she came in not knowing anyone, and we all just blended so well together. I can't wait to go shoot the sequel so we can be a family again.''