My boyfriend said "Fuck You" to me while we were arguing?

I feel so hurt. We have been together for a year and a half, he's never said this to me. We were arguing because he doesn't spend time with me, I have to beg for dates. I asked why doesn't he want to spend time and he said "Fuck you!! Stop assuming. I'm busy babe".
He's the sweetest thing and he's never said anything like this. I am so shocked and hurt. I don't know what to do? He has told me his boss at work has been giving him extra work lately because people are quitting. I'm not sure if he's taking the anger out on me? Help? :(
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I beg him for more dates because we only see each other once a month. I know he's busy at work. I know I'm selfish, but I just want more of his time. Once a month is not enough.
My boyfriend said "Fuck You" to me while we were arguing?
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