I’m (22F) thinking about leaving my (28M) partner cause things aren’t changing

I’ve been with my boyfriend for about 4 years now about a year in I found him texting multiple woman on Snapchat. He ended up deleting the Snapchat and I didn’t find him doing anything until about a year ago in April he was texting another woman asking to link up. I decided to forgive him like a dumbass. Now yesterday I found on my boyfriend’s safari him looking at a much older woman ( about 55-65) on her explicit twitter . I feel like it’s time for me to leave cause I can’t keep mentally comparing myself to these woman . As a guy why would you look at such an older woman while dating someone. I feel lost and confused. I love him a lot but I can’t keep doing this to myself. Has anyone gone through similar situations?