Threatened in a relationship?

My boyfriend and I have been together for almost four years and we have two kids together. We really have only one night out of the week where we don’t have the kids where we can have sex. Sometimes the sex does not happen and my boyfriend gets mad. He gets mad if I say no even though I feel like i am allowed to say no especially if I am tired and have had a long day. My boyfriend then says this is not going to work between us. He says this every time and that i just always make excuses. Does my boyfriend have a right to be mad and to threaten me with this is not going to work just because I say no to sex?
Threatened in a relationship?
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