Why would he be so forward and keen to talk to me, and then just completely go cold on me?

Anonymous
So I added this guy on social media because we had a few mutual friends. He sent me a message straight away, asking if I'd be interested in coming up to visit him, and saying that we should connect via a face time call soon. I ignored his initial messages because I found them very forward and then a week later, he messaged me with a job vacancy, asking me if I'd be interested in applying. I got back to him and said I'd be interested in the job, and if he would help me with my CV, and then he told me he'd need to speak to me over the phone to discuss the CV. So I spoke to him on the phone, and then he started talking about other topics, like the gym, and exercise and it felt like he was trying to get to know me.

Then I agreed to visit him, and we had been speaking for weeks, he seemed so keen and asked me if I wanted to visit him any earlier. We had a video call and it seemed to go really well. He was complimenting all my photos, and sending me messages all day saying what we would do together, and the places we would visit. Then, randomly out of the blue, he went completely cold, and then changed the nature of our conversation to a professional way, and sent me another job suggestion.

Since then, I've not heard back from him, and he has gone completely silent, and I'm feeling so insecure that I've put him off in some way. It feels like really bizarre behaviour, and I can't get my head around any of it. No one has ever acted that keen in me to begin with, only to completely shut off and go cold on me.

What is his issue?
Why would he be so forward and keen to talk to me, and then just completely go cold on me?
5 Opinion