Hi Oscliiapram, welcome to Psych Central. Sorry you feel trapped in your relationship because of the children. I respect your decision to remain faithful. Affairs can also tear a person apart inside. Sometimes things are worse than before.

Here are articles that discuss some of the issues you describe

Kids and Divorce: Ten Tough Issues | Psych Central

Are You Trapped & Unhappy in Your Relationship? | Psych Central

Why Do We Stay In An Unhealthy Relationship? | Mental Health Awareness