So, my wife wants an open marriage, I don't want it, what do I do?

I 38M have been with my wife 30F for 5 years and we’ve got two kids (3 and 1.5 years old). For the first year of our relationship, we had frequently sex and after that, my drive kinda dwindled and it went from a daily thing to a weekly, more or less. I’ve never had that big of a drive and my partner has a very high drive plus I’m very vanilla vs her being more exploring (which I absolutely don’t mind, I just don’t think about trying new stuff regularly). We have talked about this ever since our second year together until now and for a period (think a couple months) sex has increased but went back down again. I do desire my wife and love her with everything I feel inside of me, so it’s not a case of “she’s ugly now” - I just don’t have a big drive naturally. The low sex drive has been a challenge even before kids, so that period (and still a bit) obviously doesn’t help but I’m not going to excuse the kids demanding a lot of us for my low drive.

So now we are here, where she feels her sexual needs aren’t met through the relationship (I don’t disagree), she also feels “terrified” of the thought of only having one partner rest of life and now wants to feel “free and desire” in order to reignite our relationship. She has also added it could also ”just” be kissing, and not anything more.

We don’t want our relationship to end because we still love each other with every other regard other than the intimacy not matching each other. We’ve agreed to never split up while the kids are small for their sake, as we can still be parents together (which is all we’ve been for the last month, really). I also know that I would most likely be lighting myself on fire in order to keep everyone warm with an open relationship and I feel damned if I do and damned if I don’t.

I’m not really comfortable with the thought of an open relationship and any way you put it (break for a period, only kissing etc) is something I feel terrible about.

And I have told her, if she wants it, divorce.
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On a side note, I'm essentially a stay at home dad, and work from home, the wife works out of the home and is gone frequently.
So, my wife wants an open marriage, I don't want it, what do I do?
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