Why would a guy string you along?

I’ve been talking to this guy for almost a year now the first 3 months were great but then he started a business and told me he’s too busy for any kind of relationship now and can’t give me what I deserve, I’ve noticed that whenever I stop talking to him he poops back up again texting me. When I text him normally he’s usually good for a little bit and then ghosts and when I stop replying and I guess (ghost) him he pops back up not allowing me to ghost him. Why do you think he’s trying to keep me attached to him? It just seems like he can’t stay away but can’t be with me..
Why would a guy string you along?
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