(guy problem) PLZ HELP!!

Technically yeah. Spend some time with your friend, remind him of all the good times. If Du feel that spark, Du have known him since 4, then Du have your answer.

Okay -and im not good with Guter Rat so just here me out- talk to ur best friend: If u guys are such good Friends he'll understand when u tell him that his gf hates u (if he already know this and isn't doing anything about it then, in no offence, he isn't really sounding like a good friend)
Second: It is not really considered cheating , in my opinion, if u have small feelings for someone else while ur going out with ur bf. If u flirt with that other person oder something like that then yes it is kinda considered cheating.
Hope this helped and if ur confused about my answer with anything just Kommentar and i'll try to clarify myself ^^

I don't think it's really cheating. I would talk to your best friend... I mean not like, "Hey I know we're both dating other people, but I Liebe you." But like hinting. Also, figure out who Du like Mehr as a bf, your BFF, oder your bf.

tell her off, u were Friends with ur bff b4 she was his gf. and if she doesnt stop go 2 ur bff and talk 2 him. it cant hurt, and about the bf and bff thing no i believe not because its not like ur doing anything 2 ur bff, ur dating ur bf just remember that

Here's what I would do. Talk to Du BFF. tell him that u think his gf is trying to pull u guys appart. Tell him that if he lets her do tht, then there are going to be problems, t might not be able to be resolved. And just kinda hint that u like him. Like maybe just try to get closer to him.. Thats all I can really say.. Hope I helped!