My sister keeps hanging out with my boyfriend and I don’t know if I should be worried?

My sister has been hanging out with my boyfriend alone lately. She tells me about it but I think it’s weird she keeps choosing to hang out with him out of all people.

Yesterday we were hanging out together and i wanted me to go somewhere with her but she put it off till tomorrow. Later that night she sent me several pictures of her and my boyfriend hanging out playing around. My boyfriend was calling me around the time (wanting me to come over I guess) but I was asleep. The day before this they also hung out.

My sister keeps hanging out with my boyfriend and I don’t know if I should be worried?
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