"I don't wanna be here
you just wanna be there
but its awful complicated and you're warning me to beware"
is about person A wanting to be with person B who is deliberately staying away. B feels that a relationship would be very complicated and probably has issues to resolve with past relationships, etc. B might even feel like a heartbreaker and might be thinking that s/he might hurt A if they were to get involved. So B warns A "to beware" because the relationship could end badly and B is insecure.
I think this part:
"I don't wanna be here you just wanna be there but its awful complicated and you're warning me to beware"
is about person A wanting to be with person B who is deliberately staying away. B feels that a relationship would be very complicated and probably has issues to resolve with past relationships, etc. B might even feel like a heartbreaker and might be thinking that s/he might hurt A if they were to get involved. So B warns A "to beware" because the relationship could end badly and B is insecure.