@Jigsaw137 Here's one of the sources of your problem:
usually I am bored and humour myself so I speak to her
When you talk to her about dumb shit regularly, you've taught her that she can talk to you about dumb shit. If you stop doing that, you'll teach her that you don't.
So I was speaking to a girl on and off and recently she messages me when she wants something usually I am bored and humour myself so I speak to her, she was telling me this guy wanted to be FWB with her and I said I don't give a shit fuck off, how can I stop being some ladies emotional tampon, this always seems to happen to me, I just gone back to the gym in the UK as they are open and starting dieting again, but is there anything more I can do.