Is Gina's Boyfriend Cheating With His Ex-Wife?

Gina's boyfriend has a young son with his ex-wife and they seem to be on good terms. Maybe too good of terms...

She's worried because her boyfriend never spends evenings with her instead choosing to have dinner every night with his ex and their son and often claims he 'fell asleep' after dinner.

Simon advises her on what her next move should be.