The past tense of widen the gap between oneself and someone else is widened the gap between oneself and someone else.

The third-person singular simple present indicative form of widen the gap between oneself and someone else is widens the gap between oneself and someone else.

The present participle of widen the gap between oneself and someone else is widening the gap between oneself and someone else.

The past participle of widen the gap between oneself and someone else is widened the gap between oneself and someone else.