How to know if he's hacked your phone?

So i've been going out with this guy recently and things were good at first but now he's making me uncomfortable by pressuring me to sleep with him i haven't tho. but i've been trying to cut things off but he keeps bugging me so i just started to talk to someone else and i told him i wouldn't be hanging out with him anymore, of course u would first think its someone else that the girl likes but its strange how he guessed the day i met the new guy and when we're meeting and that he works with me. He hasn't been where i work at cause i haven't spotted him or anything but i feel him knowing this is a bit off did he bug my phone or something and his you can do anything just don't leave me also freaks me out.

How to know if he's hacked your phone?
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