Girlfriend is making me feel guilty for rubbing pe

My girlfriend found my porn and some of her mother's panties together in my little hiding spot... I explained myself to her. She was not understanding at all! She doesn't masterbate never has once! I stroke my PENIS 2-3 times a day, especially now cause she won't fuck me hasent now for 6 months! And gets mad if she thinks I've been playing with my penis! And she thinks I'm in love with her mom. I told her I'm not in love with her but she is attractive and sometimes I rub her panties on my cock ... It's tough cause she's never played with her pussy herself. What do I do? I have to release pent up energy daily by making my eager young cock ejaculate. Idk what to do