Edit: I wanna add this follow-up to my situation. It seems my instincts were right. The guy told me today that he was in an open relationship and was even planning to leave his wife. He did not straightforward ask me if I was interested in something more with him, but I think he made his interest clear. It is also clear he will respect the fact I do not wish for something more.

I (28F) met this guy (he must be in his late forties) on a FB group to go wall climbing. First impression was that he is very friendly. Almost too much. He complimented me a lot. From that first meeting, he started texting me a bit, telling me about his life. I somehow had the feeling he could be interested. However he looked like he could be around 50 so I shook it off. Especially since we met with the intention of doing sports, not flirting. And I even told him I had a boyfriend...

Now that we've met a few time at the climbing gym, I feel more at ease with him. He is quite funny so we joke a lot. The texting dynamic changed a bit. I started teasing him more and more. It is my way of having fun with a friend in an inocent way. Last night I teased him about his age, telling him I should "let the old man sleep". I realize the line between flirting and teasing is quite thin, but I truly believed I was neutral, not suggestive. He seems more and more straighforward with his intentions for me. For exemple, one day he told me he liked to proceed "step by step and take things slowly" after we joked about buying gifts. Now I'm a bit concerned. I wonder if I sent him wrong signals. I guess its pretty rare to build friendships with such an age gap? As a man around 50, would you think that if a young woman acts all friendly with you she's interested ?

Or perhaps I'm the one looking into this too much ? He may be teasing me in a friendly manner ?