I don't know why he refused to do things with you that he now does by himself, but this religion does strange things to people. You often get this dynamic when people are struggling with the harsh requirements of JW life, hot one day, cold the next as the cult personality waxes and wanes. Maybe you wanting to do things outside of the religion aroused his cult mind control and he wasn't ready to go there yet. Maybe he wanted you to be the good little JW wife so he could be the bad boy. Maybe he is a narcissistic, selfish jerk who cares nothing about anyone but himself. hard to say, maybe he doesn't even know
For whatever reason he has abandoned all restrictions and is now doing whatever he feels like without the burdens of marriage and fatherhood. Even though you are loney you are better off without him, trust me on that. You can now meet someone without the JW baggage. But don't be in a hurry, focus on your children and your job, figure out who you are, then you will know what you want in a partner.