Should I be worried?

[Bella1988]

I broke up with my boyfriend of six months a few days ago, and I'm completely heartbroken. He's also a co-worker, which makes it a million times harder to cope with. He's called out of work 2 days in a row now because he's depressed and having family issues. I'm really worried about him, but he'll barely talk to me and won't really let me know what's going on... it's like I don't even exist to him anymore. I know we broke up, but I still feel like he could at least tell me what's going on so I won't worry so much. We've broken up several times throughout our relationship, which I know is usually a bad sign, and a lot of it has been because of his ex. His ex had texted him on more than one occasion, and it made me start to get really suspicious. Especially because he accidently called me her name one time, and then called his brother her name on accident too, which was really weird. He promised me it was just her wanting him back and that he was completely over her, because she cheated on him... but I've never felt completely secure about it. I'm really in love with him though and I can't stop thinking about him. I broke up with him this time out of pure frustration, which I sort of regret. We haven't been getting along for awhile though. He's been dealing with family issues and been really depressed, and he doesn't seem to care about me at all anymore. He's had a lot of bad luck in his life, especially lately, and he's really down about everything and insecure about himself. I know me getting upset with him sometimes doesn't help, but it just frustrates me that there's nothing I can do to make him happy again. Just 4 days ago he was telling me I was the most important thing in his life and he loved me more than anything, and has even said he wanted to marry me. And now he won't talk to me at all or respond to my texts. I apologized to him and told him I want to be there for him and help him get through everything he's going through right now, but he'll barely reply. All he's really told me was that his second cousin is in the hospital from overdosing on pills, and that he's been through hell the past 2 days over it. He never even really mentioned this second cousin before, so I know they weren't close. And I know it's a stressful situation, but why would he call out of work 2 days in a row over it? I did overhear a co-worker in his department saying he sounded like he'd been drinking when he called today to say he wasn't coming in, but then his supervisor said he was just crying. He's been really depressed even before this, so I'm thinking maybe his cousin might of fuelled it even more. But honestly I don't really know what to think. I keep thinking he's seeing someone else, possibly even his ex, and that's why he's completely ignoring me. I can't stop crying right now, I don't even want to be around my friends or family. Should I be worried about him right now? And should I try to find a new job? Work is going to be torture now because it's just gonna be a constant reminder of him. =( I miss him so much. I don't know how to get over this.