How do you know when its time for divorce?

I'm ready to get a divorce. My husband of twelve years just cannot provide the emotional support I need at this time. I've talked to him for all 12 years. I consider myself a very supportive wife. I have been the sole financial provider for 2 1/2 years since my husband was laid off. I have really tried to support him emotionally especially knowing the stress he is under being unable to find employment. I have supported him and all his career changes (opening a new business, going back to school, etc.) but I am now fed up. I literally hate my husband. Is this too harsh? I am very stressed at this time. At work I take on more responsibility with the same pay. I still do about 75% if house hold chores. My husband has no idea how to deescalate situations, he makes the home more stessful for me and the kids. I just can't take it. When i try to vent to him, he rudely interrupts the conversation with some off the wall comment. For instance I was venting about a stressful day while he's driving, and he interruptted to say look at that store or wait let me hear this on the radio. I get so upset. I have never been in a relationship and felt so alone. I'm not asking him to be a girlfriend and listen but I would like encouragement sometimes. Something like "you know everything will be ok". Life is only getting more and more stressful, and if I can't get support from my husband than who? Is this too petty? I'm really ready to end this.

Updates
My husband has posted some very inaccurate info below. Well its like we all say there's 3 stories hers, his and the truth. The truth is I love my husband but I am not emotionally satisfied. I try to be everythingl for my husband; I am there for him physically, mentally, and emotionally. My husband is very talkative and we frequently talk about his day, aspirations, etc. Me on the other hand I am not as talkative. I find myself needing to vent when upsetting things happen in my day. I could walk around the house pissed and he wouldn't know or ask why. I'll be on the phone with family or friends and they will pick up on my mood and ask me what's wrong. Meanwhile my husbands just sitting there. In our relationship my husband is the talker and I'm the listener. I would like for him to listen ocassionally that's all. Is it wrong to think a husband should listen to his wife vent?