Am I overthinking?

ok so, my bf is the nonchalant mysterious guy, but once u meet him he's very sweet and funny.

.. He's not the type of being on his phone all day or watching another girl's (or that's what I wanna believe 😭), but, he doesn't even like all the stories I post on ig, he sees them but just like a few of them, BUT, he's been liking some of my sister's stories, like, the day of our graduation he liked my sister's stories (it was a transition) but didn't like any of my posts, and the other day he liked my sister's story (we're twins). Anyways....when we were starting our relationship, we saw each other with our group of friends and we didn't talk, he's kind of nonchalant, but he winked to my sister😭....

idk....idk if I'm the bad one here and I'm jealous and crazy or AIO?