You can't change the past, but you can ruin the present by worrying over the future.
Kristi...I have only been on one side of a situation like this..
I won't pretend to know how you feel or what to say. But from a strictly physical standpoint, please, please, PLEASE be careful. Even though he claims there was no sexual intimacy with the other woman, please remember that he lied to you about other things - and apparently lied convincingly. He might be telling the truth, but it's hard to believe he was living with this woman for a couple of weeks just "as friends." Especially considering his reluctance to break off with her.
It's none of my business whether you intend to try restoring every aspect of the marriage, but I would insist that he be tested for STDs before engaging in ANY physical activity with him. As the recipient of an STD from my husband's premarital relationship, I know firsthand the devastation that diagnosis brings.
Hugs and prayers.Kelley