] Yes, I think he might have made an offer to Lizzy. And Lizzy would not have accepted him unless she was in love with him, and she does not seem to be.

It's only in P&P2 that Elizabeth says that "only the very deepest love" would induce her to marry, not in the novel. She obviously finds the colonel attractive and enjoys his company, and he likes her back. At this stage in her life, if he were to propose, I think she would at least give the idea some serious consideration!