At a new barn, people might well talk too, the whole horse world is like that.
If you think you could progress more with your riding at the new place. I would tell the old barn that you are taking a break for a month. Ride at the new barn, make sure it's everything you want it to be - and then leave the old barn under good terms.
If you leave well, you can always go back. Don't leave because Amy Becky, Cindy did D, E and F events. Just be reasonable and polite and explain. Or lie, and say new barn is closer etc.