What an enormous jerk to do this to you. Tell him that if he wants two girls so badly he needs to find two new ones...

Oh honey. Any boy that would threaten to break up with you over something like that isn't worth your time. Period. ..
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Please don't do something you will regret to try to keep him around. No lovng person would push or coerce thier partner into something like this if they really cared about that person. ..
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I respect the rght of consenting adults to make thier own sexual choices. However, a threesome is a very tricky thing to take on in a solid, grown up relationship. And he obviously has some growing up to do. I can't see a threesome as a good thing here in any way, shape or form...

I agree with Holly. Any person who threatens to break up with you if you don't do what they want isn't worth the words they are saying. ..
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Don't give up your moral for anyone. End of Story...

I'm here to offer a woman's perspective (a woman who sometimes has just enough testosterone floatin' around in her to balance things out) .....
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What do I suggest you do?..Smile in knowing you've got your head on straight..... you knew when he first stated his ultimatum that it wasn't ok ... don't backtrack now ... if and when you choose to do anything ... it has to be ok for U ... it's your face that you look in the mirror ... u've got to be good with u're decisions ... whatever they may be...Angie..

Well, "if you do blah blah, i ll break up with you" is a stupid concept anyhow. People in a relationship do the "acceptable" stuff their partner asks them to, because they respect each others wishes and love each other. Threatening is just useless, let alone stupid and frustrating. And threatening over a threesome? This is simply disrespectful. Its a sensitive subject anyhow. If you don't want it, you don't want it. Period. ..
If he doesn't respect your decision, then he's simply not worth it. No guy / no relationship is worth damaging your self-respect...