my gf caught my friend jerking off, not sure what to think

That sounds like a really uncomfortable situation for everyone involved. It's important to consider the feelings of all parties, including your girlfriend and your friend. Here are a few steps you might consider:

**Talk to Your Girlfriend**: Find out how she feels about what happened. It's essential to understand her perspective and emotions regarding the incident.

**Talk to Your Friend**: If you feel comfortable, you might want to have an honest conversation with your friend. Understand what led to the situation and how he feels about it.

**Assess Your Feelings**: Reflect on how this situation affects your relationship with both your girlfriend and your friend. Are you feeling betrayed, worried about how it might impact your relationship, or something else?

**Establish Boundaries**: Depending on the outcomes of your conversations, it may be a good idea to discuss boundaries moving forward, both in terms of your relationship and your friendships.

**Consider Future Interactions**: Think about how this incident will affect future gatherings or interactions. It might be worth considering how to prevent misunderstandings or uncomfortable situations in the future.

Communication is key in navigating such sensitive situations. It might take some time for everyone to process what happened, so patience and understanding will go a long way.