Why are my friends and parents telling me to just go out with guy friend and stop rejecting him?

I have a guy friend that I’ve known since 3rd grade. We’re good friends. In middle school he always asked me to be his Valentine and in high school. He kept asking me to school dances and prom. Twice I went with him but only as a friend. I kept telling him no to going out because I only like him as a friend. We’re 28 now. I thought it would go away after i rejected him. He kept telling his friend that I’m going to be his girlfriend or I am his girlfriend. I told him to stop but he said that I’m too stubborn to realize that I’m the right man for her and I keep going after guys that won’t pay attention to me especially good looking guys. I’m a tall, overweight chubby big girl. We’ll I was heavier back then than I am now. I was 250lbs. Now I’m 220lbs. I’m 5’10”. He’s was chubby too and overweight, also losing weight. He’s 5’11. Big dude. I never understood why he never flirting with hot or cute girls. Okay my ex from college was. We only dated for three years but he cheated on me with a thin shorter girl.
I’ve never been a good looking or slim girl. My friends said, “Girl he has the hots for you and plus he’s looking good and he’s improving himself. You don’t find that attractive? He’s IMPRESSING YOU. He wants YOU to notice him.” If he likes me he would be asking me out which he is not, but not complaining. I’m seeing my old high school crush. My dad said, “How does (my guy friend) feel about you dating your old crush?”

I told him I don’t think he felt the same way he did back in high school and we’re just friends. My dad looked at me and said, “Oh come ON! He OBVIOUSLY likes you. Why don’t you give him a chance? Plus you’re both autistic so he understands you.” I can’t just drop my date for my guy friend. My best friend said dating my former crush isn’t a good idea and he was mean to me back in high school and I’m such a sweet girl. People can change.

Why are my friends and parents telling me to just go out with guy friend and stop rejecting him?
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