Congressional defeats in 1998 lead to Newt’s resignation. Conservatives were dismayed to see their Leader leave.
It is not accurate to say he left because of conservatives.
You simply don’t know what you’re talking about.
http://thehill.com/homenews/campaign/195427-lawmakers-not-flocking-to-gingrich?page=9
http://www.nytimes.com/1997/04/04/us/gingrich-moves-to-turn-back-any-challenge-to-leadership.html
In the summer of 1997 several House Republicans attempted to replace him as Speaker, claiming Gingrich’s public image was a liability. The attempted “coup” began July 9 with a meeting of Republican conference chairman John Boehner of Ohio and Republican leadership chairman Bill Paxon of New York. According to their plan, House Majority Leader Dick Armey, House Majority Whip Tom DeLay, Boehner and Paxon were to present Gingrich with an ultimatum: resign, or be voted out.