My boyfriend wants to go to parties out of nowhere, what do I do?

My boyfriend and I are both in highschool but he is in the grade above. Before we started dating a few months ago he used to party a lot and go out all the time. When he met me he had stopped for a little while and told me he thought parties were gross and didn't like to go to them anymore. I agreed and him not liking partying is one of the many reasons I started liking him. On the occasion we ever wanted to go to one we agreed on going with eachother. I asked him if i could go to one on my own and he said no. A few weeks later he asked to go with his friends and I said no. Now, he told me he wants to start going more and there's nothing I can do to change his mind. Im extremely upset about this and dont know what to do or say to him.

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I dont want to break up with him. I love him so much and he's so sweet. I just miss us staying in together.
My boyfriend wants to go to parties out of nowhere, what do I do?
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