We been together 7 years with a great relationship but now things are worse than ever

It's not me, it's definitely him. I've been with my boyfriend since I was 18. At 25 and he's 32, I'm far more responsible than he is. We have twin boys together and we're expecting our third son in less than 3 weeks. He says I nag him too much, he's not getting enough sex, and I need to be more relaxed. The sight of him makes me sick to my stomach, REALLY. I hate coming home. We use to have a great relationship; and, we were best friends. Now all he does is work and smoke pot all freaking day! I HATE THE SMELL OF THAT CRAP IN MY HOUSE! As far as everything else, he's a great provider when he wants to be. A part of the reason for it is that I do nag him until he gets things done. Our arguments usually start with me asking him to be more responsible and do what he says he's going to do. He'll say, "I will when I can." I remind him that he can do it at any time, like NOW! I'm the type of person that can't rest until I get the results that I need. With me being pregnant, I'm really being driven crazy because there is so much on my hands that I have to prepare before the baby gets here. I'm so freaking fed up. After all the arguing, I just feel like maybe he isn't doing any of the things I ask because he doesn't want to be with me. That's fine. I asked him to leave over a billion times if that's the case; but, he won't. I'm struggling paying all these darn bills, with little help from him. Is he just using me? Am I overreacting? All I want for him to do is take some of this responsibility off of me and handle business. It would be nice if he took out the trash, cleaned up, watched the kids for an hour so I could nap. He needs to grow the F up and help me out more with our bills and buying things for the house. I get so sick and tired of seeing him spend all this money on weed and the weed guy is spending his money at home. For our anniversary last month, I paid for everything and did everything at 7 months pregnant. In return, he hasn't done anything for me. I don't even want him to come to the hospital when I have this baby because I don't want to see his goofy face. I expect a little more out of him being so old and he acts like my child. I need a man! I could go on and on about how much he is irritating me. What should I do? I've tried to talk to him and tell him why I'm so depressed and why we don't have sex anymore is because I'm not attracted to him being so useless. He doesn't get it. Is this relationship worth trying?

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