My best friend became my crush and now he is my friends with benefits. How do I get him to like me?

we have been bestfriends for 12 years now, we stopped talking 2 years ago because I had a partner that didn't like me talking to my bestfriend because I used to have a huge crush on him when I was 14 but he rejected me back then.
Me and my bestfriend started chatting again recently and it's like we never stopped talking , we spent new years drinking together on the beach looking at the sky catching up and chatting, it felt great. now we see each other almost 6 days a week and we have so much run together tease each other an laugh.
so we became friends with benefits recently but we agreed it's only a friends with benefits thing no love or emotions involved.
so sometimes we hook up when meeting up and sometimes we just hang and talk and laugh its just so much fun with him and I'm starting to fall for him again like i did in the past but I don't think i will ever tell him because I fear heing rejected by him again.
how can I make this into a relationship? or should i just be friends with benefits and not focus on the relationship issue? I mean it already kinda feels like we are dating because of how much we hang out together but I don't know I'm afraid of hurting myself with the expectations. is there something I can do for him to see me as a potential partner? he already loves and cares about me a lot but I want him to feel that romantically not "like a sister"
My best friend became my crush and now he is my friends with benefits. How do I get him to like me?
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