Okay so…. what do I say to a guy that told me he wants to be with me?

So this guy likes me and I get so honestly I get so scared because I’m scared to have another heart break I don’t want to go through that attachment with a guy again but I also know he is genuinely trying with me. What do I do? What should I not do? any advice is appreciated
Okay so…. what do I say to a guy that told me he wants to be with me?
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