Should I escalate?

A female co-worker with a boyfriend has been showing interest in me lately. She wants to be near me, does all the flirty acts and even pressed her boobs against my body for quite an extended period when standing next to me while talking and staring intensely in my eyes, touching me as well. She is struggling with her feelings becuz sometimes she tries to distance herself probably becuz of feeling guilty towards her boyfriend. I know for sure she has feelings for me and the feelings are mutual. I tried to suppress them becuz of her having a boyfriend, but I cannot and will not deny those feelings any more. Should I escalate or does she have to becuz she has a boyfriend?

Should I escalate?
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