Genuine friendliness

Can an older married man that I spend time with be genuinely friendly? Spending time only includes working out together. He's as crazy as me when it comes to fitness. He swims, runs, and bikes. I run 10miles a day on average and was a pro swimmer. When we are together we only talk about exercises, races, and goals. We text each other everyday, usually about fitness, but also our hobbies. I've been getting mixed vibes. He has been saying how I'm in good shape and that I'm pretty often. I don't want to be over my head. What do you all think? This is a continuation from my other question: does my married boss like me.