Guys , what's worst? Rejection or not answering?

So there is this guy who used to see me whenever I go to a certain shop, he told me he was interested and I said no "nicely".. One day he waited for me and gave me a gift (perfume and a letter) , I didn't want to take it but he took me by a sudden and I didn't react so fast..

Anyways in the letter he asked me to be his lover and confessed and told me that I seem hesitant ( I think I wasn't firm enough) , he left his phone number and Facebook so I could contact him but I didn't... I just didn't know what else to tell him , plus I've been busy with family issues and thought maybe it's not suitable to reach him after a long time?

Now I'm asking would it be better if I contacted him after aaall this time ( about a month) and reject him firmly or should I just keep silent and maybe he will take it as if I'm ignoring him (even tho this wasn't my intentions) ?

I didn't go to that shop ever since, I'm just afraid to meet him and i wouldn't know what to say.

Guys , what's worst? Rejection or not answering?
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