Al i being crazy??

So I have a problem with my boyfriend And his sister. That’s his best friend at first I didn’t care but now I really feel like he would rather be around her then me. We’ve been together for three years and I got him a dog and begged him many times to take us to the park so we can play at the park he took us 2 times in the year we had him. His sister came over and wanted to take the kids to the park it was no problem. He cancels a family cookout cause his sister isn’t going. She sits on the front seat of our car while im in the car (mind you it’s actually mine neither of them pay any bill for the car) but I can’t “get in the car with niggas” my close coworker gave me a ride to work when I was STRANDED and she had her LONG term boyfriend in the car and there son. We went to the zoo and they barley spoke to me. I was in The back almost the whole time or waking to fast and no one said anything. I even started a conversation with him and he wasn’t even there, they left me in a part of the zoo not far but they had already went to the next stage. They went to another cookout was there for how long I’m not sure then he decided to call and ask if I wanted to come. They came here and smoked after he told me to be ready and then we left. No one really talked to me and they talked the whole time it wasn’t u til she said money and told on him he looked at me and started taking. We went inside to get food and she took my seats (some people did switch but she knew I was sitting there) he didn’t say nothing to I had to stand and eat. That’s just what’s coming to my head it’s small stuff but like am I trippen???