Is the marriage valid and lawful after the preceding relationship involved matters that transgressed the Sharia, and do those actions affect the blessing and continuity of the marriage?

What occurred before the marriage, such as seclusion (khalwa) and kisses, is a reprehensible act and a sin that necessitates repentance. However, it has no bearing on the validity of the marriage, as long as it did not reach the level of actual fornication (zina). Repentance erases what came before it. Therefore, the aforementioned sins will not be a cause for the removal of blessings, and a Muslim must conceal their shortcomings if they fall into sin.