On Thursday my brother Jacob Skyped me from uni. He told me that he couldn't come home for Christmas because he'd agreed to spend it with his girlfriend who didn't have any family. He told me to just tell our mum that he had loads of uni work to do because she'd be pretty mad if she knew he was spending Christmas with his girlfriend instead of us. I agreed to cover for him, and that was the end of that.
Except earlier this evening, his girlfriend got in touch with me via social media asking to speak to Jacob. I said 'why, isn't he with you?' and she said no, and he had told her he was coming home to me and mum for Christmas. She's being trying to call him since Thursday but it keeps going straight to voicemail.
Jacob has quite bad depression, and when I asked his girlfriend she said he had been a little more withdrawn the past couple of weeks. I'm very worried about him, I'm scared he might have done something stupid. I've tried ringing my mum but she's at a work conference until tomorrow evening so there's been no answer. I have a sister but she's too young to understand what's going on. What do I do? Do I phone the police or am I over-reacting?
Edit: In the time it took for this post to be reviewed (2 hours) there's been a development - I've been speaking to literally everyone who knows him and a friend said he saw Jacob this morning wandering around town but he looked very rough, tired and like he'd been crying. The friend tried to talk to him but Jacob ran off as soon as he saw him. I'm still worried but the fact that he was seen out and about less than 24 hours ago is reassuring. Can he still be reported to police if he was seen today?