Not only A chance, but a HIGH chance. Therefore, if he usually calls your cell number, you should edit his contact in your cell number and make his calls go to VM directly, so that you would not hear beeps at all if he were to call. If he leaves a VM, save them but do not respond. Saving VM's is helpful if you expect stalking and might even file for a restraining order in the future. Can be helpful just in case. Otherwise if you do not expect anything of that scale of evil, you can delete voicemails.

If you used your landline # to talk to him, call the phone company to see what options for blocking you have. I am not familiar with the landline phone capabilities.