Lure them to a secret location and ensure that they haven't disclosed their whereabouts or intentions to anyone else. Tell them that they can kill you. When in private, ask for one final kiss from them as a dying wish. They should comply. When finishing the kiss, knock them out with a sedative through injection with a needle. Call the cops and tell them that they were trying to kill you. Make sure you've recorded the entire ordeal for verbal confirmation of your crush's intent.
+1 You get to kiss them
+1 They go to jail for several years for attempted murder