My sister and boyfriend hang out... Makes me uncomfortable
My boyfriend is my best friend and we've known each other for years now but just recently started dating. Well I met him through my sister, they were off and on as friends and now that he's in my life they just started to hang out again. I know I have jealousy problems and I'm working on them, but I feel really uncomfortable that my sister and my boyfriend hang out. They were friends and I try to be as understanding as possible, but they go out to lunch and just randomly hang out without me - he'll sit in her room while she studies and literally does nothing (weird... Isn't that a waste of time?)... I've talked to both of them about it and they said that I would never have to worry about anything, they are just friends.
It's been eating at me for a couple weeks now and I just wanted to get people's opinions on the situation. I'm in my twenties just starting life as an adult. This man is truly amazing and important to me and so is my sister. He has this lovingness to him that he wants to help everyone - that's just the way he is. Am I sitting on this too much and I should not worry about it, or is there a way I can talk with them saying that I'm uncomfortable with their dates without me or something.. So lost... :(