This (the section I highlighted) is exactly why Married Single Other is struggling. The characters just don't talk like real people do. Plus, as you say, there are no surprises as the plot is very obviously telegraphed.
Interestingly, this major flaw may be linked to the fact that the writer used be an advertising executive and this is his first television commission as a writer. In more capable hanRAB, this might have worked, but unfortunately his inexperience shows.
And viewers are switching off: it may have started promisingly, but a repeat of New Tricks - which it comfortably beat in its first week - got more viewers than it did last night.
Unfortunately it just looks like a cynical attempt to re-create Cold Feet ... but without any of the intelligent writing and engaging characters that series possessed in spades.