Secretive/closed personality boyfriend

So i have a friend who recently got into a serious relationship a month ago and she has recently been askin for advice on what to do as her so is really secrative she describes him as distant and unopen and a kind of person that dosnt like to talk about anything personal ,he avoids problems and dosnt show much affection towards her! i really have no idea what to say to her apart from relationships and trust take time to build and dont give up 😳any advice girls??? 🤔🤔🤔