My hubby cheated on me on the same day I got our marriage license! I was 7 months pregnant and we were living together at the time....he told me the very next day what he had done (he was drunk when he erred) and he felt so bad about what he had done. I told him to carry his sorry no good ass but we ended up getting married anyway. It hurt more than anything and it's been 8 years and I've just now gotten to where I can think about it without wanting to kill him. He went to Iraq for over a year and I told him that I trusted him but if he did cheat on me not to ever tell me about it and he said since he did it once if I ever wanted to be with somebody I could cheat on him twice to make up for it. As for the fil bringing home std's your mil is SO lucky she didn't end up with herpes, or even worse AIDs. That part I could never forgive and I would value my life more than having a man in my life that treated me like s***. My ex step-dad cheated on my mom and brought home an std and she literally beat the s*** out of him and the girl he got it from and kicked him out to the curb even though they had been together for almost twenty years. He treated her bad too and cheated on her all the time and she it wasn't worth being treated like that for the rest of her life and she took care of herself before she met him and she can take better care of herself after he's gone. so good luck to your mil and IMO she needs to kick him in his nads and stick her other foot up his ass....sorry for the foul language when i get upset i cuss.