Dating a muslim boy?

So I've been seeing this muslim boy for about a week. We've known each other since September but we've only started dating recently. Everything was going good. One day he made a joke about how I couldn't be his wife cause I did something super clumsy. It didn't dawn on me until just a few minutes ago that muslims aren't supposed to have boyfriends/girlfriends or have sex before marriage. I just remembered a conversation that I had with my muslim cousin about this stuff a while ago. She told me that boyfriends/girlfriends and pre-marital sex is forbidden. So now I'm confused because this guy has asked me to be his girlfriend and is always making sexual advances.
Dating a muslim boy?
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