Is this relationship serious or going down the drain?

I've been with my boyfriend for nearly 5 years, we have a child together, live together and have been talking about getting a mortgage at the end of the year. Things have been great until he started his new job last year. Since then he has been going on loads of nights out with his work colleagues. Every night when he comes home he seems to go on this ego trip where every one at work praises him, nobody can out do him, hes the smartest etc etc. And he doesn't even ask me about my day. When I try to tell him something he cuts in to say what he wants to say.
When he came in from a night out the other week, I asked what bars/clubs he went to and he said he stayed in the same one all night, the next day he said he'd went to loads? I thought that was a bit odd and asked why he'd said it and he said he couldn't remember saying it. Anyway that got forgotten about.
A few days later I found him going through my phone and as its an Iphone you can see the last things you've been on. He'd checked my facebook, my emails and my phone messages. I confronted him about it straight away and he said I'd been on my phone a lot recently and as I was going out that weekend he was suspicious that I was up to something! This would have been my first night out in years for my friends birthday.
Furthermore, because he'd gone through my phone I demanded to see his. I only checked his facebook and found he'd been searching for my sister, his ex, a girl from his work and many other random girls. He'd repeatedly searched for the work girl about 5 times. He sees her everyday at work so I don't understand his interest in her fb?
I've spoke to other people and they say it sounds like he has a guilty conscience. I feel sort of insecure now that hes been looking at other girls and that after 5 years with me hes still looking up his ex.
What do you others think?

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