I used to be an idealistic person, never ever thought of lying or cheating. But now I am. What should I do?

i have been married for 10 years and all these years was hell for me. The only thing I value out of it is a lovely daughter. I cant divorce due to social stigmas and also the fact that my in-laws are cardiac patients scares me to reveal my condition to the world. I have gone through everything,,and am still going through...physical and verbal abuse. I have been accused of promiscuity too by my husband. I had been pregnant by him 4 other times, but had to medically abort due to his accusations and insecure mind. I usually tend to be subdued amidst all accusations, but try to pull on, spending time with my small job and looking after my kid. Happy times with him are very less..too less. Ii know i cant run away from my married life. But now i am confused.....i recently met somebody else who is married too but younger than me....we got closer and he revealed he was attracted to me.....i dont know if it is love or just attraction...but now i always think of him...what should i do?