Why does a clear, colorless, viscous, water-like fluid, difficult to wash off, come out upon hearing the word "I love you" from a female friend or another person, without any lust or sexual thoughts, and what is its ruling regarding Wudu (ablution) and purity?

The answer is summarized as follows: If the relationship with the girl is for cooperation in righteousness and piety, then it is good. As for the discharge, it could be madhiy (a thin, sticky, white fluid discharged upon arousal without ejaculation, not followed by relaxation), or from vaginal secretions. If you are certain it is madhiy, then purify yourself and perform wudu’. If you are unsure whether it is madhiy or vaginal secretions, the default is purity, and istinja (definition)’ (washing the private parts) is not necessary; however, if you do it as a precaution, it is good. To avoid the discharge of this fluid, it is preferable to avoid words that might lead to it.