How do I prove to my boyfriend I love him? We always have these stupid little fights when he says I love you more and I said no u don't and he says prove it. But I never know how to. So how do I prove it to him?

Tell him "if I have to prove it, then that shows that I love you more, since I never ask you to do that, and you should never have to prove your love".

You don't. Saying "I love you" relentlessly, in my opinion and experience, makes it mean less, not more. You show your love for people by how you treat them, not what you say.

If he needs you to convince him of your feelings, this will never end. I know this type - they are never satisfied - bottomless pits of neediness. You need to have balance in your life. If you're still in high school or college, your boyfriend needs to need to be just one facet of your life, leaving room for you to have time for school, work or other activities, your family, your female friends (without him there all the tine) and for yourself. He shouldn't need to constantly have your reassurance and grand gestures of love, and should not need you constantly checking in with him. If he's doing all that, well - not a good situation.

Fighting over who loves who more and how to prove it is about as childish as two people can get.
The first requirement of love is time, enduring each other over time. Without time, it's still just infatuation and romance.
The rest is all about the delicate balance between giving and taking, compromise and negotiation, sharing and communicating, finding common ground, and keeping respect and admiration for each other. That's LOVE baby.