Baby may not be his

My husband and I got into a real bad argument last night...he punched a hole in the wall, threw our flat screen TV across the room, all b/c I mentioned how he needs to get a DNA test on his daughter before he starts paying support (he goes to court in a few weeks to determine his pay for support). I told him it doesn't make sense to be paying for her if there are doubt's. His ex has made comments in the past about her not being his...but he claims she only said it out of anger or times she was mad (but why joke like that?) He grandma has made comments about her being with someone else when they were together and even his own mom made comments about his daughter not really looking like him. So when I brought it up He went psycho!! Saying that I'm always negative, I'm the only one who makes these comments, he's never heard anyone else make comments like that. And I was like so your calling me a liar? I didnt just make this stuff up. Why would I lie on your ppl and besides how could you have not heard the jokes and comments about her being yours, especially if I'm your wife and I've heard them several times from different ppl. Its almost like he doesn't wanna hear the comments. I know he's attached to the little girl, I am too...but the only thing she has is his skin color and I feel like getting a DNA would kill the rumors and doubt's. He claimed that I will be looking stupid if the DNA says she's his and I told him its not a matter of looking stupid, its a matter of being smart and knowing the truth before you pay all that money to the mom. He doesn't wanna hear it and I'm just drained physically, mentally, and emotionally... I feel like he's too stupid for me sometimes and Idk what to do. Advice? And please no rude comments....I need understanding not bashing...