When a guy says he’s not ready for a relationship and is still attached to his ex?

Anonymous
This guy started flirting with me since we met.. he straight out protected me even in our friend group and even changed nicknames for me and him together once in the group. He also called me once late night cause I slept early and he was “worried” about me cause he didn’t contact me. He also texted me goodmorning texts every morning and we used to vid call each other every night. He also surprised me on my birthday with a bouquet and showed me all the signs he liked me and even all his friends were shipping me with him. But now recently, he told me he didn’t mean to mislead me with all the flirtations and he’s not ready for a relationship and it freaks him out whenever he thinks of a serious relationship and that he’s still attached to his ex. What should I do?
When a guy says he’s not ready for a relationship and is still attached to his ex?
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