He referred to us as a couple, does that mean he thinks we are?

abw199
I've been dating this guy for around a month. He is in his 30s and I'm 20, so I inititally sorta thought he was only using me for sex, but we see each other pretty much every other day, and lately he seems more affectionate/open to including me in his personal life, although we haven't blatantly established exclusivity. We're going to the beach this weekend and he referred to us as the "fat couple". the fat part was a joke, we're not fat , but does the reference mean anything?
He referred to us as a couple, does that mean he thinks we are?
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