The 'Sorry' singer rekindled his romance with the 'Wolves' hitmaker in November, but they are taking a break following a string of rows, though insiders insist they will ''absolutely get back together'' and have stayed in regular contact, even though they're not spending time together.
The source said: ''They were having a lot of little disagreements recently and one fight in particular blew up and caused them to decide to 'break up,' however, they've been in contact the entire time and their feelings for each other have not changed.
''They will absolutely get back together and they are not over, but they both need some time away from each other.''
Another insider compared the pair - who previously had an on/off relationship from 2011 to 2014 - have been ''having issues'' and admitted they had found the ''pressure'' of conducting their romance in the public eye very difficult to deal with.
The source told E! News: ''They both have expressed that they have been feeling overwhelmed with a lot of pressure that has come with their public relationship, and haven't been seeing eye to eye on things.''
Selena, 25, is currently in New York and hasn't seen Justin since the day before his birthday, which was on March 1.
And she's said to be using her time apart from the 'Love Yourself' hitmaker to try and ''mend'' her relationship with her mother Mandy Teefey, who was unhappy about her getting back together with Justin.
The source said: ''Things are not amazing between them.''
While they may be on a break, the 'Bad Liar' singer made was was thought to be her first public acknowledgement of her relationship with Justin with a birthday tribute last week.
Posting a picture of herself holding a polaroid which appears to be a photograph of Justin, Selena wrote: ''March 1, 1994 someone I know that happens to be super cool was born. Boom. (sic)''
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