I will quote from the Bible, Old-Testament, This has to do with a man who takes him another wife,But it also applys to your marriage just the same. See (EXODUS, 21: 10-11) "If he marries her, ( You and your husband's Marriage), and then takes another wife, he may not reduce her (1) food or(2) clothing,(3) or fail to sleep with her as his wife. (First wife, You). If he fail in any of these "three things", then she may leave freely without payment". So says God. You may be married on paper, but God only recognizes "the three condition" that he has set forth in his word. The nice way for you to handle what is going on is to sit down and give him some reality therapy. Like He can ship up, and be a Husband, or he can ship out. If he doesn't want the marriage to work, or won't fill his marital responsibilities. There would be no sin on your part in seeking the fulfillment of those three things with an unmarried man. (EXODUS, 21:10-11). Gives you every right to find love in the arms of another "unmarried" man. Who is ready and willing to give you the love you need and have a right to.
Sorry about your sorry life,and Sorry relationship.
Doug.