Had it been a one night stand or a drunken romp one time, then I could see where the relationship may survive if she had been forthcoming right away.
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Op,though, is trying to control the outcome in order to suffer the least amount of damage to herself regardless of the fact that in her opinion, what she did is at the end of the day, not that bad.
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And that is why I doubt not only that will the relationship survive, but also why I don't think OP really has a clue as to exactly why what she has done will merit a scorched earth reaction from her poor boyfriend.
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"I don't want to be screwed out of a long term engagement just because I screwed somebody else 5 times. It's not like I am in love with them".
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I, who am an absolutist "burn the witches" type am also well aware that for some, this type of thing is not a deal breaker, and in some cases it has for odd reasons, allowed some couples to survive and thrive.
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