[Story missions don't advance]

Yes I've done all the assassination missions and I've saved about 10 times so 60 hours and I've just been driving around doing nothing for a while now

[Story missions don't advance]

No, Roman called me a while ago to say hes getting married but I haven't gotten this mission

[Story missions don't advance]

Yesterday I completed "Diamonds are a girl's best friend" for Gerry. Since then I have received one text message from Packie and one phone call from Dimitri (taunting me). I have progressed at least 3 in-game days since I completed the mission and still don't know what to do. Sleep mode is off and I have tried calling everyone in my phonebook, checking all my emails, etc...

Maybe someone could tell me what they did next or something because I really don't want to start over because of some f*cking stupid glitch.

Any help would be greatly appreciated.