i'm a muslim girl and i'm 100% sure to tell you that marriage is allowed during ramathan
Nothing in islam forbidding marriage in Ramadan nor in the other months, but marriage is permissible in any day of the year.
But fasting in Ramadan abstain from food, drink and sexual intercourse from dawn to sunset, if a muslim owns himself, not afraid to do what spoil fast, there is nothing wrong with him getting married in ramadan