Please DON'T worry, coz everything will be fine eventually with u.... You know, in my case at least, all things work for the best! It is good simply coz you have found out about ur partner's cheating now not later. Try to think at least about this side of the problem positively.
As you see in this forum some ppl replied to ur message and it means u are not alone... We are all with u and trying at least somehow to support u and give advices. Don't worry, you will overcome it!..:-)