Okay, I'm confused.

I would 愛 to help あなた out, but I'm TERRIBLE at giving advice. So can I give あなた this picture instead? Funny pictures make me feel better about anything.

Girls that have someone as a friend because they are only interested in his brother! Well, that sounds like something a girl would do.( Not every girl!) But あなた can not be sure about that, i mean , あなた 発言しました that あなた ロスト contact, they ve changed または あなた have changed. They got older and あなた god older. Maybe あなた have no common interests any more. Thats normal. Maybe this is why they think あなた are boring. I don't always give the best アドバイス but i think あなた should ger over it soon. People change. Noone knows if thats good または bad.

Maybe they were into あなた because of your brother..I know a few girls like that. または maybe they think you're no longer interesting または that あなた no longer make a good friend...

ok, so im a girl so i know how girls think. あなた might have grown apart but for me it would probably be because i had gotten closer to another friend and spend alot of my time with them. they could be interested in your brother but unless they flirt, get nervous, studder, bluh etc. i highley doubt it. it also depends on how long u havent talked to them. i have no もっと見る time to answer this further so PEACE OUT SUCKER BCAAAA!

I have tons of フレンズ like that... I ロスト contact with them and when I finally speak to them, they seem totally bored with me.
Maybe あなた should post this in the Advise spot, people are good at giving アドバイス there :)

they were problably using u for ur brother