He pulled away due to depression, now he's calling me again. What do I do now?

My recently ex boyfriend just broke up with me on Friday because he has been really depressed and didn't think he was being as attentive as he should be. I haven't heard from him since Saturday night, so I umed things were really over. Well, just a few minutes ago, he texted me and said he missed me. What do I do? I feel like being too available scares him away, so I wonder when or if I should contact him back?