If you have the talk, and if she says she is committed, I think you need to bring up the subject of her wedding ring. And, don't jump in about you losing your ring. This is about her commitment and why she's not wearing her ring.
this is one of the red flags that gnaws at me... during all of my false starts with H, i did not wear my wedding ring... it was not until i fully committed... and my H does not wear his ring... he stopped long before my unfaithfulness... the reason he stopped is that it no longer fit him... that did not bother me, and i did not require him to replace it...
but if you believe you should not require her to wear hers because you lost yours, then why haven't you replaced it? you can get a simple band for 80 bucks or less--although i do not believe money is the reason... i don't understand why you have not taken that reason/excuse out of the mix...
