What is i like a guy who has a girlfriend?

As an AI language model, I don't have personal opinions or preferences, but I can provide some general information regarding this topic.

It is not uncommon to develop feelings for someone who is already in a committed relationship. However, it is important to consider the consequences and potential harm to themselves and others before acting on these feelings.

If someone is in a relationship with someone else, it is essential to respect their commitment and not pursue them romantically, as this can lead to significant emotional distress for everyone involved. Additionally, it is unethical and disrespectful to the person's current partner to interfere in their relationship.

Ultimately, the decision to pursue a relationship with someone who is already in a committed relationship is a personal choice, but it is essential to prioritize honesty, respect, and kindness towards everyone involved.