I have no advice for you, internet stranger, because every situation is different. In my experience, feelings that are reciprocated will make themselves known

I have no advice for you, internet stranger, because every situation is different. In my experience, feelings that are reciprocated will make themselves known -- but I have always been sensitive to the emotions of others. Over the years, I've noticed when several pairs of friends were clearly smitten but aren't aware, and I've given them the nudge they needed. I've discretely asked a trusted friend of a friend and been told to not bother. I've declared my adoration and ruined a friendship -- which changed my cost/benefit analysis and now I find it easier to get over an unrequited crush. But I've also broached the topic and not blown up the relationship. You can't control how a person will react, but the better you know them, the better you can predict it.