Thanks for your reply. Quick update:
I texter her if (last) Saturday was ok. No reply. I texted her again about work and she replied straight away, apologizing for not coming back to me ("forgot") and she said "other day?"
I texted her back: wednesday? Then no reply and one day later an e-mail: "forgot again

(truth? playing her game as well???), wednesday's fine with me."
Today some chit chat (messenger) about work, little playful, she mentioned her bf once, I ignored it, that's it, we didn't talk about wednesday.
I have the feeling the original excitement/tension is gone and she might realize she doesn't want to risk losing her 5 years relationship. Do you think I should just cancel the thing, have some morale and focus on other girls?