<human>: Some backstory: my girlfriend and I have been together for two years. Recently she's been withholding sex, gotten angry when I told her why I was distracting myself with my phone at a party (so I wouldn't check out other women, out of respect for her), and has been playing games like crazy (sexual teasing). 

Today she came over to my house, started playing with my balls while we sat on the couch together, initiated a make out session (the whole time giggling and being goofy), led me to the bedroom, took her clothes off, continued to make out naked, played with my balls some more, and then refused to have sex. She teased me for more than a half hour, never actually letting me have sex with her, before I finally rolled out of bed, through my clothes on, and told her how unfair she was being and how incredibly mean it was to tease me. While i nursed my blueballs with a beer, she left and didn't say another word to me. 

I understand that she doesn't owe me sex whatsoever. However I'm really upset she's been leading me on, promising sex, teasing me, and never actually following through. I've told her multiple times that if she doesn't want to have sex to just tell me.

I feel frustrated, disrespected, and hurt. What should I do?

Condense the text into a few key points
<bot>: Girlfriend initiates sexy time, teases, but never actually follows through. Refuses to simply say she doesn't want to have sex. Testicles suffer.