Why do i feel this way?

Rosa

Long story short... Lately i been feeling super insecure and feeling like my ng is hiding something like if he has another. One person i have been extremely uncomfortable about is my own sister. Inhave always been jealous of her cuz she is skinnier and all and everyone i know is after her. My bf talks to her about things liek when we fight and asks her to come visit me because i forever feel alone now being a stay home mom. He even like her pics onFB but none of mine. ???? We recently fought and he was drinking he said he has messed with her more than once and now i called my sister out on it she doesnt want anything to do with me. I want things to work with my bf but it still feels he is hiding something maybe not with her but what if someone else. Even the sex doesnt seem like he into it anymore.