Love / Is it wrong for Polish girls to kiss boys before marriage ? [31]

hi
i am a kurdish man who married with polish women.we are together 8 years.we have 4 years old son.but we have a problem about ex relations. we were talking about past i asked questions to her about her life before me.she told me that she kissed a few boys in the club but only kiss(never tuching or sex...etc)she says she just wanted have boyfriend all life but because of she was a bit fat she couldnt have any boyfriend ever.she says whenever she was going out with friends she was feeling bad that she had nobody who loves her,who care about her.i am making big problem and jealous of her that she kissed a few boys before marry.i would like to aske you that is it really normal in poland to kiss boys before marry?i cant sleep or work because of this feeling and even i am thinking about divorce sometime.i love her but when i remember that she was kissing before me i dont even want to tuch her.please help me i need your advice.is kiss big problem or is it normal to kiss when you meet with people in the same day?she say she never made any mistake even before me.she didnt have sex or any sexual things and she wanted keep herself for special person who ll be her husband.

thanks for your advice and understanding