I just started a started a new job. One of the other trainees and I have been getting on and have a similar attitude/sense of humour. I have definitely been making the effort to be friendly just for the sake of camaraderie as much as anything else. Definitely wouldn't say we've been flirting just having a laugh together/swapping notes. I did ask last week if he wanted to meet up for coffee and then travel to a meeting together as I wanted to distract myself from nerves. The other day he texted asking if I wanted to go get a drink on Saturday, I said sure as I know it would be fun/rude to say no. I mentioned it in passing to my boyfriend who reckons my colleague has asked me on a date. Aibu to think my dp is being ridiculous especially as he hasn't seen how we interact? Dp can't come on Saturday (not that I'd want him to) and I'm not going to cancel.