[Answer] I Suddenly Found Out the Person I Secretly Like Is Already in a Relationship—What Should I Do?

Take it in stride—what I mean is, handle it with distance and restraint. I’d suggest this for a few reasons:

If the person you secretly like is already in a relationship, then from a basic moral standpoint, the best thing to do is to step back and not disturb them. Turning the words you never said into a blessing is also a way of giving this quiet, unspoken affection of yours a proper ending.
For your own sake, a period of cooling off can also help you understand why you never confessed in the first place. Were you too shy? Was the timing not right? Or did you subconsciously feel that the two of you were not really suitable for each other? After some time has passed, you may be able to see things more clearly.
If you want to think of relationships in terms of “fate,” then all that can really be said is that your timing with each other has not come yet. At a moment like this, any action you take may be inappropriate. The only thing to do is to let it rest for now. That may be the best way to preserve a little hope—who knows, perhaps your paths may cross again somewhere down the road.

[Thought] Many viruses you’ve probably never heard of also contain DNA, such as iridoviruses