can i take relationship with him.......

I am married women with a child son i m happy with my family bt nw days i m to much sad bcz of one incident in my life nw days i m in love with sm 1 else . we met on net social site and i gave my mobile no. to him as a frnd and he regularly call me and sms me we r talkid at ni8 to.. and he told me he is in love with me bt i avoid that but he regularly sms me I LOVE U... after some days i also hv feeling and i think i m in love with him ... nw days i feel i cant live without him he want to take sexual relation with me i also feel like that bt i dont want to cheat my husbond but my feelings are very stong for him plzz advoice me what cn i do for this situation?????