I'm stuck in a sticky situation, and I want to get out of it the right way, but need a bit of help doing so... Here's a bit of background info.
Additional info: I'm female, 20, he's 23.
L and I met at work about a year and a half ago. I instantly thought he was incredibly attractive, but because I'm quite a shy person it took a month or so before we properly got talking. At first I tried desperately not to let myself fall for him as he came across as your typical bad boy. However, after getting to know him, I realised that I had completely misjudged him, and I just couldn't help myself then. He left almost a year ago to go to another job, so I never really got chance to know him very well. He was a very private person, all I really knew about him was that he and his girlfriend had been together for several years. From what I had heard from other people, she was quite controlling - he wasn't allowed facebook, he wasn't allowed to give his phone number out, he wasn't allowed to go out with other girls without her there. Basically, after he left, I had no way of ever contacting him, I didn't even have a picture of him to look at, which obviously upset me greatly as I'd liked him for over six months at that point.
Anyway, about a month ago, after none of us at work had seen or heard from him since he left, he added me on LinkedIn and we started chatting. Please bear in mind that despite not having seen him for almost a year, I never stopped thinking about him or having feelings for him. A couple of weeks later, we started talking on messenger/skype. I asked if he was still with his girlfriend, because I didn't want to say certain things if he was. He said that they were still together, so I just sort of said "great" and moved on. However, we've been getting more and more flirty with each other, and I just can't help what I say.
Yesterday, it got a bit over the top though - he was hinting at me to take my top off and maybe send a picture (that sounds really sleazy, but he didn't ask outright like that, he said it in a casual jokey way). I didn't, because a) I'm not that kind of girl and b) he has a girlfriend. Honestly, I think if I had wanted to, we would have ended up having cyber sex (again, I'm not that kind of girl). When I said goodnight, he sent me a picture (fully clothed, pulling his top up to reveal a divine stomach), so I just made a grateful joke, said goodnight and signed off quickly. I'm not going to pretend I'm not grateful for the photo(!!), but I don't think his girlfriend would be very happy if she found out.
I feel like I need to say something to him like "I thought you were still with your girlfriend?", but I'm scared he'll stop talking to me, and after a year of not seeing/talking to him I don't want that to happen again. I have no problem with us flirting, but I don't want it to go further than that if he has a girlfriend. I genuinely just enjoy chatting to him and getting to know him, but I'm not sure whether he sees me as a friend or a bit of fun. Any advice on where to go from here?
If anybody needs more information just ask.