You look a bit fat in that dress
Now which girl would like you telling her that she is looking fat. A statement like this will definitely have you spending the night on the couch.
Your mom looks like she's your younger sister
Yes, girls love their mom, but don't ever do the mistake of comparing them, especially in the looks department. You won't score any brownie points by doing this.
I have the best time with my friends
You may enjoy hanging out with your friends, but that doesn't mean you say that to her on her face. Sometimes it's best to be diplomatic.
I can't go out because I want to watch a match
Unless your girlfriend is a sports buff don't give her this excuse very often.
You remind me of my ex
That's the worst thing you could say to your girlfriend. She will always be left wondering if you got into the relationship only because she is a mirror image of your ex.
My mom is the best cook
Women take great pride in their culinary skills. So don't ever claim that your mom cooks better than any woman in the world. You may just have to put up with burnt food for the rest of the week.
I don't like your friends
Like you love hanging out with your friends, your girlfriend loves her friends. Don't make your dislike for them so obvious. Friends can influence your girl to a great extent, so make sure you are in their good books.
Why do you spend so much on beauty treatments?
Don't question your girlfriend spending long hours in the beauty parlour. If you like to spend time playing football and getting dirty then she'd like to spend her time getting pretty. Accept it!
Wow! That girl is hot
Whether it's Priyanka Chopra or Angelina Jolie or just some random girl on the road, never ogle at a woman openly in front of your girl.
I need some space
If you feel the need for space try and suggest it in a subtle manner. Being far to open about it may leave you with too much space and no gf.