One thing to consider is that your co-founder might not actually be your friend. It's easy to think you have a relationship with someone that you spend a lot of

One thing to consider is that your co-founder might not actually be your friend. It's easy to think you have a relationship with someone that you spend a lot of time coordinating with that might not truly exist. I believe most problems in any kind of relationships are based on expectations. It can be devastating to realize that someone else doesn't actually care what you think unless it serves their agenda and result in feeling used or exploited. My advice, which I have failed at many times, is keep business compartmentalized and separate.