Words and phrases matter because when we use them we can define how we think and how we evaluate a situation, and that’s why I’m emphasizing what you say here:
i still love her unconditionally. there is nothing that can change that
Friend – if you love her unconditionally then why are you making a requirement of fidelity? A requirement is a condition – therefore not unconditional… In fact – why are you expecting fidelity if your love for her is unconditional and nothing can change that?
I guess fidelity was an expectation in your relationship, as evident by her being secretive about her affairs. No need to be secretive if she didn’t think you expected monogamy, is there? If she were to tell you that nah… fxxx it… she doesn’t want that monogamy stuff and wants to open up the marriage… what could you do SINCE you love her unconditionally and nothing can ever change that? I guess you could only go along and hope she at least be indiscreet and uses protection.
Does that sound good?
If not – then really redefine how "unconditional" your love is…
I am NOT saying this in any way to get you to divorce.
We don’t know enough about you, her and your marriage to give any direct advice on if you should reconcile or divorce. What we do know is that a) she has repeatedly cheated and b) it’s hurting you (as evident with you posting on a forum like this). We can also guestimate with alarming accuracy that since this is repeated long term behavior it’s not likely to change without some drastic action. I can tell you 100% certainty is that NOTHING will change unless you demand and make changes.
That starts IMHO by removing the "alas! Woe me!" mentality of "unconditional love" and "can’t imagine life without her" drama and restart with a clear mind about what the worst possible outcome of this situation might be, and the acceptance that your love for her is conditional.
I put this to you: The absolute worst outcome won’t be that in six months from now you might be starting on the process of divorce. The absolute worst outcome is that six months from now you find another pair of men’s underwear in her car, or get a STI, or find some pics on her phone… or whatever else might let you know it’s still going on.
Sharing her is worse than losing her.
Once again: Not saying you should divorce. But you need to be able to confront her where you aren’t questioning if she’s cheated or cheating, but STATING you know she’s cheated or is cheating, and demanding an answer from her if she wants this marriage or not.
Assuming she states she does, then you can question what she’s willing to do to save it, and work from there.
But the moment you believe your love for her is totally unconditional and you cant live without it… you have trapped yourself in ongoing infidelity.