My best friend's boyfriend doesn't believe that she loves him.

They are in relationships for 2 weeks now.
My best friend asked me that how to prove him (her boyfriend) that she loves him?
I need a good advice to answer this question.

I know that she can't really prove that she loves him.
She have to show that she loves him. She loves him. She is showing her love everyday to him so that should be enough for her.
But what is missing?

She doesn't "prove" that she loves him. That is immature, middle-school thinking and behavior.

Well, she has shown "PROVED" him that she loves him but he doesn't realized that. That's his problem isn't it?

Hmmm why the guy doesn't believe she ''loves him''
OH YEA maybe the fact that its only been 2 WEEKS!

Two weeks is not the "in love with you" stage of a mature relationship. It's an "you are interesting and I'd like to get to know you better". She shouldn't worry about proving she's in love with someone she's just started dating - she should just take the time to get to know him, slowly. She probably doesn't "love" him - she probably doesn't really know what that even is yet. Being attracted to someone, excited about them, wanting to be with them can be the start of a relationship that leads to love but in itself, it's not love. Instead of trying to prove anything to him, she should just say, "I like you and want to get to know you better. We've just been seeing each other for two weeks, so I feel things are going well." The love talk is silly at this stage.

WoW, I learned something here. Thanks a lot

One question: How do you know that "Two weeks is not "in love with you"stage of a mature relationship?" IS there difference after 2 weeks?