Have you ever had an opposite gender best friend?

So, I've had two of these types of relationships in my 41 years of being on this planet.
The first one (about 20 years ago) ended because we thought that our friendship was going so well that we would try and progress into being in a relationship, which pretty much killed the friendship on the spot, and I swore never again to get into that position again.
Now 41 years old. I found another friend a year ago, that I get on with very very well.
In the beginning there was flirtiness, navigating the lines and differences, but not long after, I pointed out that if this were to happen it would be a mistake. We both agreed that we didn't want this to happen.
From then on, we decided it was more like a "bromance" for whatever we have šŸ˜‚

We message good morning and good night, every day and update each other throughout it, as if we are in a relationship, but it’s nice to have that person to do that with.

Have you been in any relationships like this? What happened? Did they change/transform? Did things happen to the relationship after getting with someone else? Did you feel any type of jealousy or something that resembles fear of what night happen to your connection?

As long as there are guiding lines, boundaries and clear communication, that's all you can do, right?
Have you ever had an opposite gender best friend?
Have you ever had an opposite gender best friend?
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