You asked me not to judge you, so I won’t.
You clearly don’t love any of these guys enough to date them exclusively
Why hide it?
Stop sneaking around. Tell each of them the same basic truth “I like you. I enjoy seeing you. But I’m not sure about us enough to promise exclusivity”
If they’re good with that, great. If not, also great, but they deserve to know what they’re signing up for so they can make their own choice and you stop feeling bad about yourself.
What you do not need to do is tell them about each other. That helps no one and only creates drama.
For New Year’s Eve, tell the guys you’re not picking that you’re busy and you’ll make it up to them another day, maybe New Year’s Day. That’s all
I hope that helps.