Thinking of messaging a guy in my building if he's interested in sex

Title.

I am fully aware of how desperate and cringy this may sound like. But a bit of background - when I first moved to this country, I moved into a building that had this gym. I immediately used the gym the first week of moving in, working out and minding my own business. In the second week, there was this French guy, who was very friendly to me. Even without knowing me first, he was already friendly, smiling upon meeting and I swear I'm not imagining, but he sometimes looked at me several times. But, I am a very shy, very introverted guy, so I wouldn't do anything without any confirmation that the guy is attracted to me.

After several days of casual hi's and head nodding, suddenly one day he decided to approach me and talked to me. I was using a headphone, so I didn't hear him asking a question, and he waved his hands so I noticed him. I took off my earphone, and he repeated his question, he said, where I was from, I told him. Then, he asked about my gym routine and so on. Then, after awhile, we had a very nice conversation about being foreigners together in a foreign land.

Then, we saw each other in the gym again, but being a very shy guy, I would never approach him, and instead he would come to me and say hi and talked a little bit. I started to have a huge crush on the guy given how handsome he was, how nice his personality was and so on.

Now, fast forward to a year later, and nothing happened. While nothing happened, I still sported a huge crush on him, and everytime I see him, my heart will melt. But unfortunately now, from being friendly and casual conversation, we were degraded to just hi's and head nodding back, which made me sad. I don't know what changed. Maybe it's the fact that I was back to my country for a few months, so we didn't see each other for a long time, so the warmth was slowly fading away.

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Now... my question is...

I am going to leave this country and return back to mine in a few months. And, possibly how desperate and cringy it sounds, I am thinking, in the final month, I would like to send him a message on instagram, saying that I am very sexually attracted to him and would like to see if he feels the same way. If he does, I would love to spend the night at least once in the final night before my departure. Of course I will emphasize that I will respect any rejection, even in the form of no-response. But, I am afraid this is my dick talking and it might end up badly, at least embarrassing me because he might show my message to all his friends, although he didn't seem like the kind.

What do you guys think? Is it a good idea, a bad idea, or a neutral idea? Have any of you done the same thing? If you have, how did it end up for you? Looking forward to hearing from you guys.

EDIT: Forgot to mention, I'm not sure if he's into men at all. I was just thinking if taking risk here.