A man stalked his partner for months after their relationship broke down.
Stephen Rouell sent Audrey Payne text messages describing her whereabouts, followed her to the gym and turned up at her home.
He faces sentencing next month and was told all options, including custody, have not been ruled out.
The 56-year-old admitted pursuing a course of conduct that amounted to stalking Ms Payne between July 2013 and May this year.
Kirklees magistrates heard that the couple were in an on-off relationship for five years until finally breaking up in 2013.
Rouell then started sending her numerous text messages.
Andy Wills, prosecuting, said: “Sometimes they were pleasant, asking about her wellbeing.
“However some were more explicit in knowing her whereabouts, what she did and who she was seeing.
“This caused Ms Payne a considerable amount of distress.
“She felt the only reason he knew her whereabouts was (because) she was being followed.”
Rouell also turned up uninvited at Ms Payne’s home in Lower Cumberworth.
On other occasions he was caught following her.
Mr Wills said: “The defendant has attended at the gym she uses. She’s felt compelled to go to women-only activities so she can put some distance between them.
“One time she went to the pool and was followed by him.
“He tried to strike up a conversation and she went to the other side of the pool and made no eye contact.”
Magistrates heard that Ms Payne has kept a log of her ex’s activities.
He has previously been convicted of harassing her in 2008 and 2010.
Magistrates ordered a full report before sentencing Rouell, now of Branstone Grove in Ossett, on September 19.
In the meantime he is banned from contacting Ms Payne or entering the street where she lives.