The bard Jaskier traveled with Geralt for some time, as shown in the first season. In the second season, he seems fairly distraught about Geralt having abandoned him, seeming to tear up a little at one point and even having written a biting song ("Burn Butcher Burn") about the end of their journey together, with lyrics like "after everything we did, we saw, you turned your back on me" that would not be out of place in a breakup song. In fact, he seems to have taken the end of his travels with Geralt much harder than Yennefer, who actually had a romantic relationship with Geralt.
Of course, Jaskier is easily slighted and prone to be overdramatic in every aspect of his life, so perhaps that is all that is going on. Still, the "jilted lover" feel seems to be there. Is there any indication in the show, books, or interviews that Jaskier has or had an unrequited attraction to Geralt?