I personally think the blame lays firmly at his door, he knows he is out of order and and shouldnt go sniffing around other women while married...

I would tell him on Friday that you may be pregnant that will teach him a little lesson in life. Or at the very least advise him to go to the Dr as you think you have some sort of infection.

If he has done this to her with you I wonder how many other young girls have fallen for it ?