What do I do here...

[crownjules]

The situation:

I went whitewater rafting with a bunch of friends this past weekend. Had a ball, probably one of the most fun weekends I've had in a long time. This girl came along who is a friend of my best friend's ex-gf (who also came along), and we hung out a lot throughout the course of the weekend. She is a really cool girl, not to mention f'n cute, and I would love to "get to know her better".

The problem:

She has a boyfriend. She only mentioned him once or twice when she called him early on (our car broke down on the way up and he was a potential way of getting up there, but she didn't really want him coming - more on that soon). Even though she referred to him as a boyfriend only, she was wearing what looked to me like an engagement ring (the only ring she was wearing). I work with a girl that more often than not refers to her fiancee as a boyfriend, so I of course am wondering if the same applies here.

Normally, I don't chase after girls I find out are involved with someone already. I just view it as wasting my time going after something that I have one more huge obstacle to overcome. However, I spent a lot more time with this girl and she's not one to pass over so easily.

Other key points:

- As mentioned earlier, she wasn't keen on the idea of her BF coming along. From snips of convos I overheard while we were broken down, there might be possible relationship problems. The only concrete thing she said to me was that she wanted to have fun this weekend and him coming along would have put a stop to that.

- She was very outgoing towards me. For example, I was freezing one night since I didn't pack a sweater or coat, and as soon as she noticed she quickly offered me her sweatshirt (she had two). She seemed to always come to me first to give me a hand back into the boat after our numerous dumps (we told our guide to take us down the river the hard way so we lost people almost every major rapid). Lots of other little things, too.

- Upon dropping me off and saying goodbyes, she gave me an especially big hug that wasn't expected and told me she enjoyed hanging out and had a lot of fun.

I didn't ask for her number or anything, figuring that would be a little weird at this point, but I did extend her the invitation of hanging out again soon as a group. Getting her number wouldn't be too difficult I imagine, since I know her best friend. Like I said, I just usually give up as soon as I hear mention of a boyfriend and go on to find a different girl, so I don't know what approach is best to take here. Anyone with experience (preferably successful experience) in a similar situation know what to do here and can give a few tips?