Some advice for you. Stop.
It happened to me but it was for 2 weeks and I was lucky I never had to see the OM again.
I hurt my wonderful husband and our 2 children, I hurt my inlaws, my parents etc. Everyone was affected by my stupid selfish actions.
I told my husband that I had been texting and had kissed the OM.
I thought I was in love with him, I wasn't I was simply enjoying being chased and flirting which was different from what I had at home (together 15 years).
His wife called me and I admitted it all, told her I would never forgive myself for the pain I inflicted on everyone.
He chased me but I should have ran a mile. There are no excuses.
My husband is kind and wonderful, the man didn't even measure up to his socks.
It's been 4 years, I have worked damn hard to build trust, to show my husband what he means to me, how sorry I am and how I made a mistake that I would never replicate.
I have never to this day seen him, they didn't stay together (a friend told me this) and I feel sad for his ex wife and children, I could have contributed to that. I since learnt he had been unfaithful in the past.
Please wake up - NOW, unless you want to leave your life and start again with this man.
I am lucky my husband is such a good man he gave me another chance, I still feel sad at how I ever could have been so stupid and niave.
To those who say once a cheater always a cheater. No. Some of us learn the hard way and realise the impact and what is most important in our life and will never ever be in that situation again.