Are my friends right about this situation?

I had a crush on this woman (24). I wanted my current girlfriend to agree to an open relationship, but she said no. The woman seemed to be into me (even my friends noticed), but she found out I had a girlfriend and backed off. I made a move on the woman, but she rejected me.

To get back at her, I take my girlfriend to spots that this woman visits frequently. When this woman sees me and my girlfriend, to my satisfaction, she looks like she is dying inside. When I talk about how I spoil my girlfriend, she looks like it’s killing her.

I thought it was pretty good revenge, but my friends think I’m going overboard and being unfair. Are they right?
Are my friends right about this situation?
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