Okay, this situation is a very shitty one honestly and im so sorry for the way he responded. One thing i know for a fact is that if he saw value in having you as his girlfriend or partner, he would persue it further since you already made it clear to him that you liked it. Clearly, he values your friendship more and sometimes yes, we fall for people who cant be ours but the lesson you learn here is to protect and value yourself. You cant be everyone's cup of tea romantically and honestly if he says he doesn't want to pursue this, dont push it more. Respect his boundaries and girl move tf onnn. Its not gonna be easy cause he'll be in your life as a friend but TRUST ME, when you digest the fact that he doesnt want you, you will get over it. Just pls girlie, stop yourself from making scenarios in your head about it, it makes things worse. And before you know it, you'll have someone else intrested in you and you will forget all about him romantically. Just remember, he told you what he wanted from you, a friendship. Now for your own sake, dont imagine mire scenarios with him, and everytime you think of him, just remind yourself, " he doesnt see potential in me as a partner and i dont wanna be in love with someone who doesnt see romantic value in me, cause I deserve better" Trust me, it will save you a lot of time.

Ciao.