What does it mean when your girlfriend treats you like a burden?

I am at work all day and she gets off earlier then me and my car is in the shop so I ask her to pick it up and she starts giving me attitude

she also gave me attitude last night if she could pay for a load of laundry for me which was 2.00 and two nights prior I bought her a meal that was 25

What does it mean when your girlfriend treats you like a burden?
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