My boyfriend and I have been together for 2+ years.
He broke up with his ex over the phone (it was a long-distance relationship but within the same country). She apparently always wanted a clarifying conversation in person, but he didn't want to meet her in person anymore.
About 4 months after their breakup, she texted him saying that he was the worst, as she rightly suspected that he was in another relationship. Of course, she blamed him for that.
Then, last year before Christmas, we were lying in bed watching something, and she wrote to him on LinkedIn saying that he probably texted her, but her phone was stolen while she was on vacation, and she gave him her new number so he could message her on WhatsApp.
He explained to me that he had sent her a message on WhatsApp weeks ago, which didn't get delivered, in which he asked her to return his keys (after 2 years by now), as he wanted to give up his apartment. Since she didn't respond on WhatsApp, he went on her profile on LinkedIn a few times. She saw that and therefore sent him the message. However, he assured me that he has had no other contact with her otherwise.
Would you believe that? Why would one think, after 1.5 years of no contact, just because the person clicked on your Linkedin profile and your phone was stolen, that the ex might have sent a WhatsApp in the meantime?