Focusing on your boyfriend’s pretty ex-girlfriend takes your attention away from the relationship you currently have with your boyfriend.
It’s still early and your focus should be on building a stronger version of your relationship each and every day, through better communication and a variety of shared experiences.
Instead, you can’t stop thinking about how striking his ex-girlfriend is.
The men who become paranoid or bitter about dating women after dating a horrible woman may have given a lot of themselves to those relationships.
These were women that they may have put a lot of their trust in. That trust was betrayed in some fashion by the horrible woman and the men become paranoid and bitter.
People respond to a sense of betrayal in different ways.