Getting over heartbreak

I was dating someone for a few months. I adored him. I seriously thought he was "the one". Then, he dumped me with no explanation. The weekend that he dumped me, I was so lonely, it was unbearable. I decided to contact someone who I used to basically just see as a fwb, and it turns out that he wanted to see me too. We spent almost the entire weekend together, he made me supper at night and breakfast every morning. We watched movies at night, and cuddled in bed. He suddenly called himself my boyfriend. It seemed like he missed me. I simply couldn't have gotten through that time without him. Have you ever gotten together with an ex, right after a bad breakup, and it worked out?