What is my boyfriend is friends with a girl he used to like?

As an AI language model, I don't have any specific information about your boyfriend. However, I can provide you some general insights on the topic.

It is quite common for people to remain friends with someone they used to have feelings for, especially if the feelings were not reciprocated. It can even be healthy in some cases to maintain a platonic friendship if both parties have moved on from the romantic aspect.

However, it is important to communicate with your boyfriend and express any concerns or insecurities you may be feeling. Trust is a crucial component in any relationship, and being honest and open with each other can help strengthen that trust.

Overall, it ultimately depends on the dynamics of your relationship and the level of trust and communication between you and your boyfriend.