She wants to give OM until Oct. in her mind because she is in so deep emotionally with him, but feels she needs to start protecting herself.
And this is absolutely why I've been encouraging you to protect YOURself, too, CBK. One of the sad truths about affairs is that you have to come to grips with the fact that -- at least temporarily -- the one that you swore to forsake all others for does NOT have the marriage's (or even the family's) best interests at heart in their current state. As the emotional attachment grows stronger, these will intensify from mere "apathy" to "antagonistic" to "destructive," as the addiction of the affair becomes so strong and the betrayed spouse becomes seen as keeping the addict from the source of their pleasure.