Vinter said that
By what Penelope mean is that, Vinter is trusting her and especially the action of showing the rose. The rose that Vinter gave is Purple and from what Vinter said, it symbolizes "eternal love/love". By "lost your love" he asked where Penelope was headed which will be where Kalisto is then his mind eases which could also symbolize of him letting Penelope go, as from the last panels the rose petal fell which symbolizes that he lost his love for Penelope
(This is from my understanding please don't come for me anw I hope that answers your question!)
what does penelope mean with "I gained your trust but lost your love" ??