How to be happily single??

A man pursued me, claimed he fell in love with me, claimed he was interested in marriage, he said that I “checked all his boxes”, asked me to be his girlfriend, asked me to be his valentine, said I was his person, introduced me to some of his friends and family……only to confess that his ex still has his heart. To make matters worse, he said that every time we hung out or cuddled it reminded him of his ex. Fear men!

How does one build a life where they are genuinely happy single? Aside from the cliche “find hobbies”. I have so much love to give and I know I can focus on self love but how do I stop craving a life partner and be happy solo. I was single for a year and now I’m starting over.