'You want to tell me / 50 ways you've left your lovers'
A reference to Paul Simon's song Fifty Ways to Leave Your Lover [link].
'You want to tell me / how you loved 200 others...'
This could conceivably be a reference to Annabel Chong, who had sex with 251 men in a day — though the [documentary film about this feat] was only released in 1999, the same year as 69 Love Songs' completion.
- [Lyrics and guitar tab] from stephinsongs web site.