It's essential to respect your friend's boundaries while showing empathy and support. Here is an example of how you could respond:
"I understand that you're going through a tough time right now, and I want you to know that I'm here for you. It's perfectly okay if you're not ready to talk about it. Just remember, I'm ready to listen or help whenever you feel comfortable. Take all the time you need. In the meantime, if you want to distract yourself or just hang out, I'm here for that too."
Remember, everyone deals with personal issues differently. The most important thing is to provide a safe and supportive environment for your friend.