Re: Husband's sudden disinterest in sex
From my experience (as a man), when a wife/partner continuously refuses to be sexually intimate with her man, the message received by the man is LOUD AND CLEAR, "She does not love me or want me or accept me". I would suggest that is where you are really at, you really don't love him, want him, or accept him.
If that is the case, then you should not be surprised if he decides to do something about it (I wish to stress here that I am not condoning infidelity, but you need to face up to the reality that very often there are significant reasons for a man to stray).
A normal healthy man can not live without a sexual outlet, it is an inescapable biological/physiological need for a healthy man to ejaculate at least once or twice a week. This is not just something he would like, it is a need. Sex drive for men is firstly a bilological need, and then in second place an emotional need. If a man is deprived of a healthy sexual release such as an intimate relationship with his wife/partner, then he will need to find an alternative...not might...he WILL...GUARANTEED!
I would suggest that he has almost certainly found some other outlet, perhaps just pornography and masturbation, perhaps seeing prostitutes, or having casual sex with strangers, or he is having an affair. If he isn't having an affair, I would just about guarantee that he is thinking about it.
It is pointless suggesting that you have sex with him against your desire or will, this is not going to help. If you love him, then I would suggest that you need to consider ways to meet his needs, but only if you love him and you want to give to him as an act of love. If you don't love him, and you aren't willing to meet his needs, then why continue the relationship?
It is unfair and unreasonable to expect him to live out the rest of his life with you in a celibate life. When a man gets married he promises to live a monogomous life, not a celibate life. If you love him, work to find a solution to meet his sexual needs in an acceptable way for both of you. Perhaps you need some professional help with your lack of libido, and if that is the case then get some help. If you don't love him enough to make an effort to meet his needs, then be upfront with him and end it.
If you don't make a determined decision to solve this issue, he will, but it probably won't be the solution that you would like.