Shooting the guy when it was the gal that sent it? Y don't u go give a low blow to that gal instead. I think that expecting a 'perfect' no problems relationship is like expecting your mobile phone to always have full bar signal everywhere.

Stop being taken for a fake ride by novels and movies that portray unrealistic dream relationships. Even rich movie stars are problematic  couples sometimes.

Taekwondo black belt is nothing after you try other martial arts and realize it's flaws, especially when you get knocked to the ground. But at least still better than people who don't learn it lar ( in terms of Martial Art know how)

I think u should take out a piece of paper while in a calm environment and do SWOT analysis. Write out Strength , Weakness, Opportunities, Threats of the relationship and then decide yes or no and what ideas you can do to improve it. Is that -ve porn picture worth more points that the other good things you have for each other? Sometimes it's just a dirty tactic from the other gal, u break up, u lose.. she wins. Will be helpful for you to know her motive.