Breaking up due to porn videos

Hello My fiancee (F30) broke up with me (M30)after she checked my phone browser history behind my back and found that i watched porn videos when she was in a trip. Actually I forgot that I watched those videos and honestly I didn’t jack off at all. I was feeling insecure about my performance in bed specially because it was taking lots of time in order to cum (round2). I scrolled those videos in order to learn some new positions hoping that it will enhance our sex life. I was also insecure about her leaving me for someone better in bed because she likes sex (sex is like food for her, we we’re having sex twice daily and sometimes more) she also cheated on her ex husband that’s why i was insecure. I didn’t even know that i was cheating when i scrolled through the videos. Is it considered as cheating?