From friend to possible stalker

I had hung out with a guy friend of mine back in January, who at the time had a girlfriend. I have never had and interest in him more than our friendship but he has definitely felt an interest in me before. On that day he began to express to me a dissatisfaction in his relationship and his sex life. He had stated that "it had been a year and a half and he still can't even get a handjob and that he realized that he probably will not loose his virginity to her". He then tells me that I'm the only other girl that he talks to, Implying that I am the only other girl that could do that for him. After this he asked me 4 times if I'm a virgin, if I have ever given a blowjob, what kind of sex acts I have done with an ex, and proceeded to tell me 2 times that I have no idea how many times he's thought about fucking me, all over the matter of an hour. To all of these I rejected to answer, told him I will not talk about this with him, and that he should not be expressing this.

I was so shocked that I don't even think I could have reacted the way I would now. After that night I have been ignoring him. He contacts me everyday through Snapchat or text, to which I have responded once in the past seven months of this and all others I have opened and ignored. I have seen him twice at events but I have made a point to avoid him and be cold. And he has contacted me stating that he has seen my car when I'm out and tells me he knows my location. He seems to just wanting to talk as friends and try to see me but I am so disgusted by him that I can even fathom it.

With all this leading up to last night, where he messages me a goodnight Snapchat and tells me that he misses me, which I opened this morning. All of this activity has leads me to believe he is somewhat obsessive. I have no idea how to address the situation or if I am overreacting. I just fear that it will progress to stalking tendencies.