are they sure it wasn't 'false memory syndrome' - memories planted in her mind by the shrink to make her THINK she was in love w/ Methos??
and still - he wouldn't believe her anyway -- after all that stuff w/ the Horsemen? no way --- he wouldn't trust her -- that would be like MacGyver and Murdoc becoming best friends -- yeah, Murdoc just one day says 'Ya know, MacGyver, this chasing you around, trying to kill you thing, it's just not working out as I'd planned, so ya know what? i'm just gonna quit. See, i saw this shrink and she convinced me that i really don't hate you, really? i love ya man! I think we were really friends before and I was wrong to try to kill you. Whaddya say, MacGyver?' --- and Mac immediately finds a way to get the hell out of there --- why? b/c there's no way Mac would believe something like that - not from Murdoc -- argh! same situation w/ Methos and Cassandra - he wouldn't believe her - why? experience!