Why im I suddenly drying out during sex?

Im young my husbands the only man ive had sex with and i used to get really wet but suddenly i started out wet and then it just goes away after 10 minutes of sex and i have to relube with spit which is not to great and its not so much thats its just plain dry but this might be tmi its just the wetness after a few minutes is more sticky and thick then the slimy like discharge that helps intercourse this more well stops intercourse. Any advice or reason this would happen and ways to fix it like i said it just started happening.