How would you go about showing a character’s bisexuality without telling that they're bi?

For example my FMC is demi-bisexual and she was in a hetero romance and then broke up for a while ,courted a girl but since she couldn't forget him,she broke up with her too and in the end the MMC and FMC get back together.

My FMC experiences little to no romantic attraction to women,she's heteroromantic, but she was attracted sexually to this female friend of hers so that's why she said yes to her ,thinking that she'll be able to forget him,so would this be problematic in terms that will it come across as she's just using her?

If so ,should I change it?