<human>: Can you give me a shortened version of the text?

So yesterday I found out the my girlfriends mum bitches and complains about me pretty much all the time. Theres no reason for this i'm a polite guest when i go to their house I cook for them, take their dogs out for walks, don't leave mess or make noise.

To my face she's perfectly nice and we get along but my girlfriend has finally come clean and let me know behind my back she has a massive issue with me. My gf has told me she takes my side when her mum is like this but its just really got to me how there's no reason for to have such an issue with me. For example we went out at the weekend and they paid for me to get into a place and bought me lunch while we where out. I thought this was a nice gesture and thanked them for it, all i got from her mum was a moody "yeh" not the standard "oh it's fine" or anything along those lines. As soon as i left my Gf's mum went on a rant saying such things as "I can't believe we paid for him!" 

Apparently she's having money troubles but took out about £60 that day and threw it around like it was nothing, then seemed to blame me for her doing that even though my cost to her for the day was under £10. 

she's also gone on a ten minute rant because one night when i was over because I had"used the toilet too many times" I'm trying to not let this effect what i have my Girlfriend but i feel i can no longer go round her house or interact with her family, I don't know if this will come between us, if anyone whos been in a similar situation or could help me with how to go about the future of our realtionship since this has all come to light could chime in i'd be greatly thankfull!!!
<bot>: Found out my Girlfriends mum pretty much hates me, think it's changing how I see our realtionship.