Praise to be Allaah
Four steps of immoral love:
1) Gaze - when we look at other gender, it can leads us to immoral feeling. This situation leads to haraam things and major sins, including mixing, touching and zina (unlawful sexual relationships), all of which stem from looking (IslamQnA)
Allaah says: “Tell the believing men to lower their gaze (from looking at forbidden things), and protect their private parts (from illegal sexual acts)”
[al-Noor 24:30]
2) Mind
3) Words
4) Zina - there is a lot kind of zina including of eyes, of ears, of mouth, and last our genital.
From A Study at Al Adab Musholla Gadjah Mada University Indonesia and
https://islamqa.info/en/20229