What shall I do?

I have been with my boyfriend just under 2 years. Last night he seemed a bit off with me so i asked him what was up, for him then to hit me with "I'm not ready for commitment and basically i want to sleep with lots of girls"
He called me this afternoon saying he can't decide what he wants, I'm devastated. He's sending me cute goodnight messages. Its so confusing and I'm so scared to lose him to this. Why would he throw this away just for sex with different people?
What shall I do?
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