Hi nak, you can still be close to your friend even if you change your major, can't you? Afterall there can be a lot more to friendship than seeing each other x times a day/week.
True there might be a bit of a distance between you if you go your "separate ways" with your majors but that doesn't necessarily need to be a distance you can't bridge in time, once you work out a schedule in still remaining in contact, once you see/share the deeper things in the friendship.
If the friendship's meant to last it'll hold out whatever, and if it doesn't then there's still the opportunity to develop friendships just as (if not more?) meaningful as you go on with your new major, as you go on through life.
A friendship is supposed to help you be all that you can be, whatever the situation, not hold you back in what you want to do. So maybe give it a go and see where it leads if the major is right for you??
I know that it can be real tough letting go, but either you're not going to have to let go (and it'll show you how strong the friendship is) or you're going to be able to "spread your wings" and give something new a go.
Then even if the new major doesn't work out at least you'll have tried, at least you'll know. No looking back and thinking "What if...".
But tell you what, why don't you have more of a look into what the new major involves first, maybe talk to students (?) doing it/who've done it, or talk to the tutor. And also have a deeper look into where it may take you when you've finished it??
Just go with what feels right for you.
Alison