My ex wants to get back together in the future but claims its not the right time as he hasn't slept with anyone else?

Anonymous
As it states in the title my ex brought up with me that he wants to get back together, he claims that at the moment its not the right time because he's worried that because he hasn't slept or been with anyone else that it will affect us having a real relationship because like before it clouded his judgement and thinks that its bound to happen again. I dont really understand this and if anyone does can you please explain this to me. Why does he feel he needs to sleep with other people in order to have a relationship with me?
My ex wants to get back together in the future but claims its not the right time as he hasn't slept with anyone else?
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