be at somebody's side
stay by somebody's side
not leave somebody's side

Because she was being paid to stay by his side.

I'll stay by your side in good times and bad.

"But if you come, stay by my side and don't draw attention to yourself."

No matter, I have sworn to stay by your side.

"I'm supposed to stay by your side until you're safe at work this evening."

Had he stayed by her side all night and never gone to bed?

And it is anybody's guess whether public opinion will stay by his side.

Jack vowed to stay by her side, no matter what.

We ask that you stay by our side in the days to come.

"Just stay by my side and don't look surprised at anything I say."