Is he curious or straight?

I need advice. I've been friends with this straight guy for almost 10 years, and for a while I had a big crush on him. He knew I had a crush, and he used to tease me big time. He even sent me dick pics at one point. Fast forward five years and we haven't spoken much, just busy with our lives. He's married, has a kid and another on the way. Obviously not even close to the realm of being curious let alone thinking about me, right? Well, whenever I mention his wife or his kids he changes the subject or doesn't respond. It's always just him wanting to hang out. I get the sense he's not happy in his current living situation, but that might be horrendous wishful thinking on my part.Tonight was a perfect example of this. I took a nap earlier, and he had texted me three times and sent a message on Facebook wanting to hang out and watch a movie together. Is this guy just wanting to be a friend or is he curious? I turned him down tonight because I had so much homework to get done, and frankly I was groggy and didn't feel like going out in general. He seemed so disappointed, and I can't help but feel like there's something going on beneath the surface. Or maybe I'm reigniting a crush.Try not to judge, as I have no intention on being a home wrecker. Just looking for some outside input.