Western with two guys that work and traveled together, I believe they might be guns for hire. They always tell each other the truth and have great respect for each other.
They go to this town where one of them falls for a woman. This woman turns out will sleep with anyone. While the cowboys are building the new couple a house she makes a move on the other guy and he rejects her. Later she is kidnapped and the two cowboys go to save her. The one cowboy tells the other that the woman made a pass at him. The guy thanks him and they go to rescue the woman.
They find the people who kidnapped her and she is apparently sleeping with the kidnapper now. They “rescue” her anyways.
After years of travelling together they split up with the one cowboy marrying the girl.