Help (Boy Drama)

So, there is this boy in my school who I started to hang out with in like December, but after like 3 months of talking we got very close. So in the end of January he told me he liked me, but the thing is I am not sure I liked him back, so I told told him I would get back to him. Then for Valentine’s Day I heard that he ask some other girl out, but he has been spamming my phone every since. In public I try not to go near him, or even talk to him. This only thing is he keeps on bothering me. I want to keep the friend zone relation ship, but I don’t want it to be weird. Please any suggestions of what I should do?!? :) ❤️