The Moon isn't exalted in Cancer; it's in its own sign.
The aspect between Mars and Venus is an applying sextile,
not trine. They're not the same thing! Sextiles are weaker.
The applying Full Moon is not encouraging. It suggests that the Mars person has just left some sort of crisis situation, something stressful (Moon separating from Mars) but that the crisis isn't over with (Moon opposed Sun); this can also describe recent events in your own life, but indicate that you are still being pulled in different direction. Full Moons are not happy aspects, usually.
In short, I think the prospects for this are likely to be a short-term 'fling' rather than anything enduring. Venus placed in the 5th emphasises romance rather than a long-term thing, especially with the applying Mars/Venus aspect being a sextile rather than the more optimistic trine (and Venus/Mars perfect with an aspect to Saturn). The Moon is in a stressful aspect, maybe indicating that your emotions are pulling you in a direction that may not serve you.