How to reject her without making her feel bad about herself after kissing?

JohanCruyff

I am in love with a woman since 2 years ago who was rejecting me during long time for unknown reason, until she finally revealed me that she has been in a relationship with another guy. I see her everyday because we work together. After a while, thinking that I have no option with her, I dated another woman and 3 days ago we kissed. However, yesterday, the woman who was rejecting me, and I am still in love with, asked me out and told me that she broke up with her boyfriend and that she wants to be with me. I 'm so confused, because the woman I kissed seems liking me a lot from the beggining and I don't want to make her feel bad. At the same time, although I like her, I am strongly in love with the other woman and if I reject her I feel like I would regret it for my whole life.

How to reject her without making her feel bad about herself after kissing?
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