A younger guy shows signs, is this flirting or is he friendly?

Hey, So I'm 24, this guy is 19, we click as friends, yet he's quite affectionate and all over my social media since July, tell me I'm beautiful, etc, yet he is kind of 'too serious'. I don't try to pursue, never had dated a person this young , yet he tells me I look 16. We met 2 weeks ago, he invited me to his friends' event, he invited me again a week ago and we talked quote a lot, told me he wanted to meet again and asked to come to another event. At night after meeting, he sent me a meme with little kinky context, then he did not text for 3-4 days. He texted me today and we talked about going to one of my favorite places in our town, it's a lake where I joked I see mermaids sometimes, and he said he wanted to see one and then marry the mermaid. It was obviously a joke, but is he pursuing me? :D he's not vulgar, he's not even too obvious or something, he's very chivalrous and polite, but just wondering how to read between the lines. I think he's also not very experienced, I had a long term (4yr) relationship before, ended it this summer, so I'm just thinking out loud and trying to do right... I like being around him though, he's respectful, calls me his friend. thoughts?

A younger guy shows signs, is this flirting or is he friendly?
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