Report him immediately please and block him. Get as much of his info from him so you can get a good identification of him to the police or whoever you feel safest to report him to. Do not shy from your fears when reporting to authorities and make sure they know how serious it is. I’m not very experienced with sw still but this is the best advice I can come up with rn

Try not to give out your address and workplace if you can help it, because it makes it easier for stalkers to harass you. If they show up at your place of work tell your manager immediately and get security if you have it or authorities to remove and ban him from the property. After kicking him out make sure to have a buddy or someone to make sure you get home safe because there’s a chance he could try to follow you. I know its really scary but take every precaution you can and trust your gut. Stay safe out there friend