My Lena did the same. Though not out of spite (mostly) She's generally nice, so she wasn't going to just turn down Jeremy's attempt to mend relations (they've been at neutral because of Louise etc) but she's also not a sucker who'd recommend Ivy to reward his cheating ass.It's actually a lot of fun. Tell Jeremy that "I'll talk to Ivy about you" and then warn Ivy to stay away from him.
I promised that I would talk. But not what exactly I will tell her. Be careful what you wish for.
My Ian was lukewarm about Jeremy when speaking with Ivy (they're friends but that Gillian business was a very recent yellow card) so Jeremy is still in purgatory as the result. Forever teased while everyone around him taps dat ass.