UPDATE Need advice about a touchy subject

So my bf told me that he wants to do something similar to swinging... like with another couple.. he described it as we start having sex with each other then we switch. He claims it isn't cheating bc we would both be there...

But idk how I feel about this..

What do u guys think????

He said he just wants to try it. So I'm guessing he means a one time thing. But there are some major concerns:

Does this mean I'm not good enough for him??

Also he hates condoms. I mean literally refuses to use them so. Like ya what about that??

And what happens if she gets pregnant?

Or how about STDs??

Ugggggg idk I'm worried if I say no our relationship is going to die but at the same time something like that could kill our relationship to.

UPDATE -- i asked him how he can say he loves me but he would be ok with me having sex with another man... He says that it's completely different..

How is it different? If I have sex with another man I'm having sex with another man. That's not different. That's still not something he should be ok with if he truly loves me