How to get him to stop talking to me? ?

I’ve been talking to a guy for almost a year now and he seems sweet and all, but we haven’t ever met in person. We video chat on occasions and all that good stuff, and talk all day via Snapchat! Now I’m not interested and I’ve told him I don’t want to talk to him and that it’s not working for me but he refuses to leave me alone. I know I could block him but I’m trying to be mature and talk to him about instead of blocking him. I don’t understand why he just won’t respect me enough to leave me alone. any suggestions on how I can get this done without being immature?
How to get him to stop talking to me? ?
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