Many people believe that a sexless marriage means that the love has gone, which can only end in divorce. If you believe that sex is the foundation of a marriage, maybe you should get divorced because you are heading for old age as a very lonely person. Marriage is the cake; sex is the cherry on top. Don't worry I'm not about to bring religion into the equation, you have enough to deal with already.
What was it that attracted you to your partner in the first place? Looks are only a part of the chemistry and certainly aren't a basis for a long lasting marriage. Once you remember the important things which added up to actually making you want to walk down the aisle, only then can you start to pick up the pieces. Maybe your partner made you laugh or was very supportive and understanding. Bring back some memories; this will help you to start to fix the problems.
When a couple have a problem they usually do want to talk about it, you just have to be available when they want to talk. Part of any marital problems stem from one of the couple not listening or missing the signs all together. If wars can be solved over a diplomatic table, a married couples problems can be dealt with by talking, or at least the road to harmony can be built.
If you or your partner has lost interest in sex, you owe it to each other to discuss the reason why. A marriage can not continue unless problems are addressed.
A sexless marriage can be hard to overcome, with the right attitude and the best help; you will get through it together. Marriage is the joining of two people, so it takes two people to make it work and also two people to solve any and all problems.
Don't bottle up your problems, if you need help then admit it, even if it's only admitting it to yourself you'll be half way there.