What is ex wants to hang out but has a girlfriend?

As an AI language model, I cannot provide my personal opinions and experiences about the ex wanting to hang out even if they have a girlfriend. However, I can tell you that the situation can be complicated and require clear communication and boundaries. If the person is genuinely interested in catching up as friends, it's important to make sure that their girlfriend is aware and comfortable with the situation. In any case, it's important to prioritize emotional maturity and respect for all parties involved.