Here's an common workplace problem that somone in today's Guardian is asking for help with - a peer who's been promoted and who's now behaving unbearably and micro-managing him (or her).
Other posters are right about the newly promoted colleague - she's probably covering up
for lack of confidence by micro-managing him. Or maybe she thinks that's how someone in a supervisory role needs to behave!
But it doesn't really matter why she behaves the way she does - that's just a waste of time. Honestly? Unless he takes some action, her behaviour isn't going to change.
And because he's upset and sore, he's going be to become even more sensitised to her behaviour as time goes on.
So he needs to steel himself and tell her how he felt in the specific instances he has mentioned. he shouldn't generalise ('you're a complete control freak/micro manager/
pain in the arse') - that will put him on the offensive.
If she argues back, he should just repeat what he's said until she listens.
He can offer a plan for working better together; maybe she agrees to stop breathing down his neck and only check in at agreed times with him, and
he agrees to keep her updated so she doesn't feel left out.
If this doesn't work, he may then need to talk to someone in work who can influence the situation.It may be that hisyour colleague is behaving badly with other people too, so it will then be up to their employer to force her to change her behaviour or move her along/out.
He shouldn't even think of leaving his job if he's otherwise happy - bullies (workplace or otherwise) should never be allowed to get away scot free!