Feeling guilty for selling my horse...?

Okay, so...I wanted to get this fancy dressage horse called Kleine. So, i have her....sort of. She has to be payed of by August. When I rode her to try her (first 3 times) she was awesome. She didn't spook and she was just great. Now, I have her and she is WAY more hyper than I thought she was, and she spooks a TON. I still have W, and we're kind of trying to sell her. I feel like I've made a HUGE mistake by buying Kleine. I feel like she's not the horse for me and I just want to have Wanda now. What should I do?! Please help!!! every song I hear, remeinds me of W and I cry all the time. I thought this is what I wanted, but now i'm not so sure. PLEASE HELP!!!