You definitely need to tell your boyfriend sooner rather than later. Not doing so is nothing short of cruel and selfish. I was in your boyfriend's place but didn't find out until 21 years later. I still feel like I was played for a fool and resent her for it. I chose to stay, but mainly for the sake of my kids. I am also about 10 years from being able to retire and a divorce at this stage of my life would wipe me out and set my retirement back another 10 years. If I was 20 years younger and no kids, I would have walked away.
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