Our biggest fight yet

Well...we just got into our biggest fight yet. He hasn't spoken 2 words to me since or I him. I don't know what to do this time. The dog had the runs the night before last and I didn't notice it until after I woke up. I knew he'd be coming home any minute after taking care of colton so I just left him to deal with it when he got home because I have picked up after that dog so many times in the past I just really didn't want to do it again when he's his dog and I knew he'd be walking through the door. If it was going to be hours away form him coming home then yeah, I would've cleaned it. but apparently since I didn't start cleaning it up before Michael got home, Michael was angry and he didn't say hardly anything to me yesterday, or last night. Then this morning he goes downstairs for almost 2 hours to talk to Tina about it and a few other things. As he was fading away on the couch I picked up his phone to plug it in and there was a message from Tina saying he shouldn't be in his situation and that it would be better to be alone than to be used. So I asked him what they talked about and why she would say that and then he mentioned he needed to vent about yesterday so he talked to her. Once he started talking about why he was angry that I didn't even bother to pick it up, I got irritated which then progressed to anger because if my kids had made a mess I know he would have left it for me to clean it up because they're my responsibility. So if the dog is his responsibility, why should it be my job to clean it up when he was gonna be home any minute anyway? I don't think it's fair for him to expect me to do certain things, if I know he wouldn't do them should the tables be turned.... We fought for a while going back and forth and I asked him why he just wouldn't say anything but talk to Tina. He says he doesn't like confrontation (which I know) but even though he may not like confrontation and would rather just push it to the back of his mind until it fades...that's not how healthy relationships are supposed to work. I told him this. That if he's upset at me we should talk about it and clear it up between us because even if he thinks ignoring it makes it go away, it does not go away. I've tried talking to him and getting him to talk to me, but he won't. NOW he gets upset and talks to others and still won't talk to me. We didn't reach a resolution to our fight, we barely talked about it and now he's not speaking to me. The only thing I've been able to do is cry and I feel like I'm in a no-win situation that doesn't seem the least bit fair.
So the whole thing is my fault because I didn't pick up after the dog when he thought I should and it's just another thing to add to the horrible list of things that went on this week.....