When did you know that your relationship wasn't going to work?

I noticed signs long before all the other crap people say
withdrawing like a stranger touched her
over protective of her phone I never searched through
wanting to go visit relatives alone
buying herself flowers ?
A sigh ,like she had something to say but just couldn't say it
lots of signs ,I just let her convince me it was all in my head
I knew to trust my Spidy senses