How do you know if its "love bombing" or not?
Really this question comes down to an issue of boundaries and of perception.

It seems to be asking "Can I trust others?" but the real question is "Can I trust myself to make good judgement calls".

Love bombing is a term from cult psychology. Its the practise of having the cult members bomb the new recruit with love so they feel like the cult is a kind of heaven of earth. Once they have been bonded to the cult, its members and its leader the "love bombing" stops abruptly leaving the new comer wondering what they did wrong and trying to figure out how to fix the relationship.

Similarly on a micro level between two people ( a narcissist is a cult of one, they are both leader and god head) some people use the term "love bombing" to describe the early phases of the narcissistic relationship dance.

Personally I find the term a bit excessive and jargonistic so I dont use it much. But this video explains what this "idealisation" phase looks like and how to differentiate love bombing or idealisation from genuine interest by asking people to check in with their own intuition, instinct and emotions.