I am glad to join you in hoping life will be better than I imagine for Charlotte! (:D)

Elizabeth was prepared to see him in his glory; and she could not help fancying that in displaying the good proportion of the room, its aspect and its furniture, he addressed himself particularly to her, as if wishing to make her feel what she had lost in refusing him. But though everything seemed neat and comfortable, she was not able to gratify him by any sigh of repentance, and rather looked with wonder at her friend that she could have so cheerful an air with such a companion. (28)

I see what you mean and after looking up the definition of animosity I think it is too strong a word for what I meant. However I do think Mr. Collins is still resentful when Lizzy arrives at Hunsford and Lizzy is right that he wants her to regret what she has lost in refusing him. He is described so twice by the narrator while still in Hertfordshire.

"My dear madam," replied he, "let us be for ever silent on this point. Far be it from me," he presently continued, in a voice that marked his displeasure, "to resent the behaviour of your daughter. (20)

As for the gentleman himself, his feelings were chiefly expressed, not by embarrassment or dejection, or by trying to avoid her, but by stiffness of manner and resentful silence. (21)

Lizzy’s rejection mortified his pride because he felt she could not say no but I am not sure he actually believes she thinks badly of him. Rather I think he feels she is rather silly. He does not see himself as deficient and does not understand why she rejected him: