I need help, rn..

I met this boy and were kinda dating, he wants to visit me someday and meet me, but I don't have feelings for him anymore, and I don't want to be in a relationship with him, but its kinda too late.. he loves me alot, he stays up for me, and that's kind and all but I don't wanna be in a relationship with anyone atm. It's not a phase, I'm saying because when we met he asked me out and I have been single since forever and said yes. I srlsy don't know what to do, and I don't want to hurt his feelings, he is the sweetest guy I've ever met. I was also very tired and all that when he asked me, and I'm pretending to love him back, even though I don't want to, and if I keep doing so and them tell him how I feel it'd be worse.