Has anyone else had this happen to them?

• You got into an argument with a coworker (or someone else you see regularly). You had a bitter falling out.
• You were required to be around them again (maybe due to work, or whatever). You make awkward small-talk but it's still clear you hate each other.
• You continue to make awkward small talk anyway, pretending that it doesn't make you uncomfortable.
• Your enemy reciprocates. The two of you begin to climb the intimate conversations ladder.
• Both of you act like friends. But, at least from your end, it's not clear if you really are friends. Neither one of you has apologized, nor have you agreed to disagree, or really made any commitment to end hostility. You have no idea whether your enemy has moved on from your fight, and is ready to resume friendship; or if they're simply carrying on a charade of friendship like you.
• Conversations with this person become really awkward, as you're not sure whether to engage the "enemy-with-whom-I-treat-like-a-friend-just-to-act-civilized" protocol or the "real friend" protocol.

Any advice? Am I the only one that's experienced this?