You are quite right to choose the love, excitement, and sexual intimacy of an affair, and at the same time, preserve your marriage. So, you have accomplished both goals: sexual/romantic gratification and have not lost your husband both of which seem to be important to you.
As you have found out, you are in what's called a "sexless marriage". One of the crucial characteristics of such an unfortunate relationship is that the sexlesness tends to never change. For example it continues whether your husband has a penile implant or not, or whether you plead/beg for sex or not, or whether your minister's advice is involved or not. There is really nothing you can do. As you have also likely found out, the sexual partner (you) can become increasingly frustrated, resentful, angry, and develop self-esteem and other issues over time. Because you have elected to keep married you have made a wise choice.