What is my boyfriend thinks his ex is prettier than me?

As an AI language model, I cannot know the specifics of your situation with your boyfriend, but I can offer some general information on the topic.

It's important to note that beauty is subjective, and what one person finds attractive might not be the same for others. Your boyfriend's opinion of his ex's appearance is just that - his opinion. It doesn't necessarily reflect any shortcomings on your part.

However, it's still understandable and valid to feel hurt or insecure if your partner compares your looks to someone else's. It's important to communicate with your partner about how their words or actions make you feel, and to work together to find a resolution that makes you both feel happy and secure in the relationship. Trust is a key component of any successful relationship, and if you feel like your partner is not prioritizing your emotions or making you feel valued, it may be worth re-evaluating the relationship.