Kylee Schultz

I’m not sure how to use this but I have to get some opinions. I am 17 years old and have been dating my boyfriend for almost a year now. He has a sister who is 12 (6 years younger) and she likes me. There are literally no issues with him except for the fact that his sister always comes before me. I am an only child so I always put him first but I don’t always get that in return. Whenever we hangout at his house she always wants to be with us. She will make comments like “why don’t you ever hangout with me” (which he does a lot compared to some other people I know). She will also sit on his lap and hang all over him. Honestly, I sometimes feel like she is more his girlfriend than me. I try to be understanding because he goes to a boarding school 3 hours away so when he comes home we both want to spend time with him. It is just hard tho when I always feel I am competing for his attention. I am trying to hangout with him more outside of his house but it is hard because he can tell I am avoiding the 3 of us together. Mainly he blames me and says I am older and shouldn’t let it be a competition but I don’t know how not to because she’s the one who’s competing. I don’t want things to end because this is literally the only issues but I don’t know what to do. Suggestions?