Getting a divorce decree is not easy.Divorce is not favored or encouraged, and is permitted only for grave reasons.
First she get a decree of divorce then you can marry her.Without divorce second marriage is an offence under section 494 of ipc. Live in relationship also will be treated as an act of adultery punishable with jail term, should your wife lodges complaint against you in this regard.
Mere texting is not a crime.At the casual dating end, people just go out and get a coffee with someone because they find them fun, interesting, challenging etc and there are no expectations and no pressure.
Dating is a stage of romantic or sexual relationships in humans whereby two or more people meet socially, possibly as friends or with the aim of each assessing the other's suitability as a prospective partner in a more committed intimate relationship or marriage.
Within the meaning of section 12 of the Hindu Marriage Act,1955 the Supreme court in case of Suman Kapur V.Sudir Kapur, AIR 2009 SC 589 ruled that remarriage by party not to be done before expiry of period for filing petition against decree of divorce.
So you have to wait till appeal time.