What to do if unhappy?

I'm a 24 year old male been married for almost 5 years. love my wife and she loves me. but she feels old and stuck and won't forget about my issues of flirting with girls on apps early in the marriage. meanwhile she has full on cheated 3 times. I don't want to leave because we have a son and invested money and time in this but she doesn't seem to be putting in the same effort to fix this as I am and I'm feeling drained... thoughts and help?
What to do if unhappy?
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