[There in lies the problem. The hurt is so strong, Wolfram and Yuuri might never be able to go back to the way things were, even if they wanted to. Sora moves the communicator back over to Wolfram, petting his ears a little too]
Wolfram [Sora says as gently as he can] Maybe you really need some time away from Yuuri. Your heart is broken right now, but don't let it stop beating because one boy was... incredibly careless with it. You are a wonderful person. You are quick, and bright, and loyal, and nice looking... and you smell good too.
He did betray you, but you don't have to let that take over you. There are other people out there that would be honored to be loved by you. Our first loves aren't always the ones we end up spending our lives with.
If he is seeing other people, well, I think you should consider it too. You may just find someone who loves you more than you could possibly imagine.
And if, in time, you both realize that what you really want IS each other, then neither of you will have any regrets about choosing each other.