Try to reach out and communicate with him/her.Give enough time to decide wether yung relationship nyo is still worth saving.If you stilll both want to things work out then just take things one day at a time.Avoid that blame game, it wont help at all,it will just worsen the conflict.Wag ka masyado obsessed regarding third parties.May malaking instances kasi na sa obsession mo you'll tend to stalk that person just to find out and help you figure out what's wrong with your relationship.Wag ganun,avoid that ,it will only cause you much pain.In a relationship di talaga yan maiiwasan na may mga conflict and third parties but then don't spend too much time trying to come up with such perfect person rather try working on moving forward.Huwag mo din ipagsigawan sa lahat.Not even in social media.Just talk to someone you can trust but make sure you do it cautiously.Mind you,if ilahad mo sa lahat ang nangyari,you wont be ready for such judgment.You wont like the way people will stare at you and look your relationship differently.Wag ka masyado magpadala sa iniisip ng family mo o even mga friends mo.Yes they may give useful advice to you but then in the end its all depends on both of you pa din.Stop asking them about wether you leave or stay.As much as possible never let the judgmeny of others cloud your decisions about the relationship.Ones opinion cant replace your own.Be sure to reflect thinga first prior making big steps.Wag kang padalos dalos ,di porket nagkasala isa sa inyo,divorce agad ,pack things and go away.Dont be that kind of person.Take time to reflect all that had happened.If there's still a chance give it time until things back to normal.It takes time to regain trust.Dont rush things.It's ok to let your feelings out,ilabas mo lahat but not to the point na sasaktan nyo ang isat isa physically.It is also important to listen to both side of the story ti be fair enough.As husband /wife much better if you talk regularly ,check each others feelings.We all know that strong communication is a must to make relationship stronger.Mas mahirap talaga e deal yung cheating lalo na pag may mga anak na kayo.