Am I overreacting to my boyfriend's jokes about cheating/breaking up with me?

Anonymous
Okay, so my boyfriend and I are both still young and even though we've had pasts with other people, this is the first real relationship for both of us. We've been together for about three months and it's going pretty nice, but I do notice that he jokes about having another girlfriend or breaking up with me over silly matters frequently. I understand that these are just jokes, and he'll usually respond with 'jk' afterwards, but I still don't feel quite comfortable with it. Usually with the girlfriend joke he'll be like "I'm texting my Russian girlfriend with double D's" or something along those lines, and I just don't feel like he's exactly satisfied with me. I've never completely confronted him about this and usually just nod the jokes of with a "um okay". He does reassure constantly that he loves me dearly, and he wouldn't do something like that, and I believe him, but I'm still not entirely comfortable with jokes like these.
Am I overreacting to my boyfriend's jokes about cheating/breaking up with me?
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