Luke- Welcome and thanks for sharing your concerns. I have some serious thoughts I think you should consider. Never accept an intimate act from another person regardless how far it has progressed if you become uncomfortable. Never accept the pain inflicted by someone during sex. Ever. Never let anyone verbally abuse you and say demeaning things to you in the context of sex if it makes you uncomfortable or fearful.
You deserve to be respected and I encourage you to accept nothing less. And its really good that you spoke with the officer regarding your safety concerns. If the friend has your number, he will probably text you again. Be very careful how you respond, if you respond at all. If he is a stalker, you won't have any doubts 'cause he will let you know. And always, always, always listen to your instincts.
For now we see through a glass, darkly.