Crossed a line with my husband’s best friend

I’ve known my husband’s best friend for years—he’s like family, even godfather to my kids. We’ve always kept things strictly platonic, but there’s been this… tension. recently, he showed up after a fight with his wife, and we ended up talking late. One thing led to another, and I asked if he needed a way to blow off steam. I can’t believe I did that. What the hell is wrong with me?