During the ensuing months, Jung wrote to Freud about the relationship, at first accusing Spielrein of having tried unsuccessfully to seduce him, and then admitting that he had become romantically involved with her. He sent a series of letters to Spielrein's mother, writing "no one can prevent two friends from doing as they wish...the likelihood is that something more may enter the relationship". Spielrein also wrote to Freud, making it clear that, for a few months, their relationship had been in some fashion physical, it had involved what Spielrein again called "poetry": "In the end the unavoidable happened...it reached the point where he could no longer stand it and wanted 'poetry'. I could not and did not want to resist, for many reasons' Eva Spielrein threatened to report him to Eugen Bleuler and came to Zurich to do so, but in the end decided not to. Meanwhile, Jung had resigned his medical post at the Burghölzli, although he continued his laboratory work and university teaching. A document-based account of these events, including the three-way correspondence among Spielrein, Jung and Freud, appears in Launer's biography.