<human>: Can you give me the gist of the text in a nutshell?

Hello all!

It may be best to open with somewhat of a synopsis of recent events:
I recently was left by my girlfriend of four years. Things were kind of going downhill, so (at first) it came a surprise, but I've come to terms with the whole thing and am working to move on. 

I knew things weren't going well (in my last relationship) when I began to seek the attention of other women about a year ago. A co-worker and I began talking about eight months ago and I became very attracted to her. However, I never pursued her because I valued the relationship with my ex so much more than a new fling. 

This same girl recently admitted to me that she had feelings for me in the past. We've hung out a couple of times after this incident, mainly just taking walks after work. She's super flirty.

Unfortunately/fortunately she has a boyfriend now. It's long-distance, they met at a party over the summer and he only comes home during school vacations.

Last week, she was upset and told me he had cheated on her. It was nothing too serious... he had supposedly made out with some girl while completely wasted. I don't mean to downplay the situation, but it could have been worse. She sounded like she was willing to make amends.

He came home for Thanksgiving, so who knows how it's going now. 

THE QUESTION:

I see her tomorrow and I want to tell her how I feel, but I don't know if it's the best decision. I'm hoping you all can enlighten me to what would be the best move for me at this point. I want to keep her as a potential option in the future. I'm not completely set on her, I would just like to get to know her more. Maybe lunch dates or something harmless.
<bot>: Young guy who wants to know how to tell a girl (who has been attracted to him in the past) how he feels currently even though she has a long-distance boyfriend who slipped up and made out with some other girl.