I am so sorry this happened to you. I have a very dear friend who has experienced her hubby cheating on her now more than once. Within a year he has cheated on her with two very dear friends of hers. Needless to say her heart is broken and she still continues to love her husband, forgive him, and try to move forward in her life. She feels of course that she cannot trust her husband not to mention her own girl friends. (of course she trusts me though!!
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Know that you are NOT alone with this, as there indeed are others. I can only give you the same advise I gave my girl friend. And, that is to follow her heart and do what she feels is best. No matter what choices she makes regarding her marriage I will support her and always be there for her when needed. It would be much easier for me to sit and tell her what I feel she should do but that isn't my place, it isn't the right thing to do.
Only YOU can decide what is best for you. The bottom line is you deserve happiness, and I hope you find this.