Ouch, that's bad.
Regarding significators, since you made this chart, 'he' is always represented by the 7th house. On his 5th house cusp sits the Venus, I presume a gf, so we could use 11th, that is his 5th for his gf, represented by Mercury, on his dsc.
As far his faithfulness and his sincere affection goes, from this chart I am getting a 'yes' since he is represented by Saturn, in an exalted position, and even on exalted degree if I am not mistaken, in his 9th house. Sounds true to me.
I would not look for any aspects, because of the nature of the question, regarding only his intentions and morals.
I might be wrong but this is just what I see. Hope it helps