Why do I get so annoyed with my gf?

Basically she does a lot of things that starts to irritate me very badly now and as soon as she does one single thing that I kinda don't like recently I don't want to talk to her anymore. She dresses slutty and I had no problem with it but now I do and it gets annoying because were in a long distance right now its like she wants atttention so she dresses like that. Basically she craves attention and says on thing and always does the other like shell help me study, and I tell her before she commits that if she can't she doesn't have to and she says she can... 30 minutes into it she hasn't helped at all because she's talking to her friends and then she has to leave. After going through this for months and months I my patience is so slim I just don't feel like talking to her then she complains that I don't want to talk to her. I feel like I have a lot of built up anger
Why do I get so annoyed with my gf?
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