Why this guy ghosted me twice?

I met this guy on tinder and later on he added me on IG. We exchanged texts for few days then he ghosted. After six months which is now he text me hi and asked me if i am still interested. I replied him back that i am interested but i want to take things slow. He said thats alright and he respect my feelings. So we were having smooth convos until he decided to disappear again. Why he keep appearing and disappearing from someone's life?
Why this guy ghosted me twice?
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