Should I tell my friend about my feelings for him even though he is in a relationship?

I think I’ve caught feelings for a friend of mine. For a while I thought he had some for me but I was in a situation ship with his friend (that ended horribly/dramatically). I didn’t think I had feelings for him at the time but then he was like a white knight after my breakup (always supportive and took my side).. and then he entered a relationship with another girl. He keeps talking about his issues with her and does not seem very happy either (I could very well be wrong). And recently we went on a friends trip and were pretty much cozying up to each other, sleeping close to each other (to a point where I felt his schlong pressed against my butt), staring longingly through each other’s eyes, sharing the same drinks and all. I have since developed feelings and I don’t want to mess up the current relationship he has, that’s not the person I am. However, I understand that once someone catches feelings for a friend, they are not really friends anymore… And I can’t tell my bff because she used to have a huge crush on him. So I don’t know what to do

Should I tell my friend about my feelings for him even though he is in a relationship?
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