Abandon

a·ban·don tr.v.

1. To withdraw one's support or help from, especially in spite of duty, allegiance, or responsibility; desert:
2. To give up by leaving or ceasing to operate or inhabit, especially as a result of danger or other impending threat:
3. To surrender one's claim to, right to, or interest in; give up entirely.
4. To cease trying to continue; desist from:
5. To yield (oneself) completely, as to emotion.

Doesnt this mean that if you just walk out of someones life without a care or concern that you have abandoned them? How can a person be caring and yet just walk out of someones life, just leave, just abandon them without any care or concern?

How can a person abandon someone they care about and then later walk back into that persons life like nothing ever happened, like nothing is wrong, like it didnt happen?