Spouses - Confessions

I have been married to my husband for 5 years and we've been together for 8 years but he is addicted to porn. Some days he thinks he has a problem but other days he don't. It is ruining our relationship to the point that Ive cheated on him twice to try to make him realize that I could leave but I dont because I love him and want him to get better so that we can be a happy family. On New Years Eve we made a resolution of no more porn and no more cheating. However I just caught him yesterday doing it again. My heart is hurting,Im having pains in my chest and left arm. I feel like Im dead inside and the thought of suicide has crossed my mind several times. I dont know what to do anymore to get this to all go away before its too late. Someone please help me.