Is "se" ever used with gustar outside the case of reflexive liking each other?
no, gustar is only used with "se" in reciprocal sentences:
María y Marcos se gustaban mucho cuando estudiaban juntos en la universidad.
María and Marcos liked each other a lot when they studied together at Uni.
We may sometimes use it in a reflexive way when you say for example you like yourself in a certain way:
Me gusto mucho con el pelo corto.
I like myself a lot with short hair.
Outside that, I can't think of any other situation you'd use se with gustar.
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