Eh. Relationships and friendships are fragile things. Someone can acknowledge that someone else would be a good fit for a romantic relationship and still realize that this particular person is too strong of a support pillar within their friend network to risk losing to a breakup. A friendship is a lower stakes, less fragile, and often still highly supportive relationship than a romantic one. Its not really a scumbag move to avoid risking a friendship to gain a romantic entanglement. If on the other hand your only motivation in the friendship is romantic interest, its probably best to make that known, disengage entirely, and working on finding a new interest. There are too many excellent people out there in the world for any one person to have only exactly one best match