@Chrissye33,
sexted = text-cheating
she's cheated on her bf by sexting/texting with two people
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when you and your bf/fiance first got together, did you discuss what you both consider cheating?
if not, sit down and do it now - definitely consider counselling around communication before proceeding with the relationship
don't assume you both agree on these things
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since there seems to be a pretty fundamental communication gap between the two of you, please be very sure that there is no chance of pregnancy