We all react in different ways... When you've discovered your significant other has indulged in a relationship with someone else, there are several things to consider.
The initial shock can seem overwhelming, but after the anger, hurt, and resentment wears off you'll be left with some life changing decisions to make.
There are several factors to take into consideration when making these decisions. Never make a decision in anger. Take some time to get over the anger so you can think rationally.
First evaluate why your significant other would have the desire to become involved with someone else. There are those who don't consider a marriage or relationship sacred. There is nothing that can justify this type of behavior. You'll need to determine if the person would choose to cheat with anyone they were involved with, or if there was a specific reason this may have occurred. If there is a reason, was the reason a valid feeling of rejection, or an isolated act of bad judgement.
Often times anger and hurt can stand in the way of resolving problems. If this is the case, you may want to consider seeking the help of a marriage counselor. A trained professional can assist in opening a line of communication to pave the way to recovery and closure. This is especially advisable if there are children involved.
If you choose to stay and work it out, it is important to find closure. Your continued relationship holds little chance of success if you can't let it go and move forward. Sitting in silence and acting as is nothing happened is a sure way to set yourself up for failure. Make a conscious effort to rebuild your relationship and give it a chance to grow stronger. Find activities that you both share an interest in and can participate in as a couple. Take walks and reopen the line of communication, discuss your goals and desires for a brighter future. Rekindle the romance in your relationship and find ways to keep the fire burning for the duration of time together.
If you choose to leave, first consider everyone involved and how it will affect them. This is particularly important if there are children involved. If there is no chance of reconciliation, staying together for the children is not in their best interest. Children deserve a healthy, loving family relationship. While divorce is never easy, time has a way of healing. Be certain to make the children know that the break up had nothing to do with them, and it is in no way their fault. Work on ways that will enable the children to experience a strong relationship with both parents.