Hi welcome to the forum. This is a known bug unfortunately and is often tied to teens being promised. Try using the 'ask to be just friends' option and nullify their relationship. Once you have built the relationship back up the options for gf/bf and propose should once again be available.
There is also an open bug report about this
here (click)If it is the clubs points you are meaning, yes this is also another known bug. It can be caused by editing lots that are empty through the manage worlds menu.
Bug Report about this
here. There doesn't seem to be a work-around for this apart from to build back up the club points and not to edit any empty lots!