All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If your husband prays the five obligatory prayers, then we advise you to remain with him and continue counseling him as to help him stop this negligence. You will undoubtedly be rewarded for that (If Allah Wills) because whoever calls for a good act, he is entitled to get the same reward as the person who actually does the act and those who follow him in such a deed.
But if your husband does not pray, you should advise him and stop having sexual relations with him until he prays. In fact, some Muslim scholars believe that the person who gives up praying out of negligence and laziness, is a non-Muslim. There is evidence in the Quran and the Sunnah backing this opinion. (May Allah protect us from disbelief). It is known that it is forbidden for a Muslim woman to marry a non-Muslim man. Now, praise Allah for guiding you to the right path. Be kind, patient and soft with the sinful people. Call them to enjoin the good and avoid evil in order to help them get out of the bad situation in which they are.
We ask Allah to guide you to doing what He loves and is pleased with.
Allah knows best.