In Jainism, diksha (दीक्षा) – becoming a sadhu/sadhvi – is understood as a lifelong, one‑way renunciation.

Monk/nun diksha means:

• total giving up of family, possessions, and worldly identity
• accepting the five great vows (mahavrata) in their absolute form
• living only for spiritual progress and liberation, not for worldly life ( jainknowledge.com)

Because of this:

• By principle and ideal of Jain Dharma, one who has truly taken diksha does not “come back” to normal household life.
• The decision is made only after very deep testing, guidance of acharyas, and firm nishchay (inner resolve) that this is the final path of this life. Stories and teachings always show diksha as a final renunciation, not a temporary experiment. ( jainknowledge.com)

However, from a purely practical angle:

• A person might become weak, break discipline, or leave the sangh in real life – but this is considered a fall (avashyak, dosh, or charitra‑bhang), not something approved or allowed by Jain shastra or tradition.
• Such a person is not regarded as a proper sadhu/sadhvi anymore, and spiritually it is seen as very serious bondage of karma.

So, in simple words:

• According to Jain Dharma’s ideal:

• If someone wants spiritual progress but is not fully ready to leave worldly life forever, Jainism clearly recommends shravak/shravika life with 12 vows, paushadh, samayik, etc., instead of taking diksha and then thinking of coming back. ( jainknowledge.com)

If you want to understand what actually changes in a person’s life after diksha, you can read more here: