Okay, I know it sounds confusing. Do the Sun, Saturn or Jupiter aspect the part? If so then it's activated. Jupiter moreso than the Sun or Saturn, but for a part, I'd look at triplicity and term as well. That's assuming you were born in the daytime. If you weren't then the Sun isn't the triplicity ruler - Jupiter is.
If none of the rulers aspect the part, it probably isn't going to be a significant factor in your chart - unless your 7th house is *******. At that point, the part may become very important.
If they aspect it, how do they aspect it? And if it is seen by either Jupiter, Saturn or the Sun (day birth only), what other planets aspect the part?
What house and sign is it in? Again, it may or may not rule your love live - it depends on whether your 7th ruler sees the 7th house and whether the 7th ruler is strong enough (not combust or otherwise horribly afflicted) to do the job.
If your 7 ruler is okay, that will be the main ruler. If the part is activated (seen by its rulers) it will add some information. If your 7th house ruler is ******* and the part is activated, it will have more rulership over your love life.
You really have to take the whole chart into consideration. Here's a place to start: Go through your chart now, and see which houses are seen by either the domicile ruler or the exaltation ruler. Domicile preferred, but exaltation will work. What shape are the rulers in?
The ones that aren't seen (and most of us have some that aren't) are the areas of life where you're apt to have more difficulty. Are there planets close to the cusps of any of the unseen houses? What are they up to?
A planet in a house, especially near the cusp of a house, will likely play out earlier in life, and probably be more noticeable than the house significator - but the significator's always going to be playing a role too - at least if it sees the house. Well, even if it doesn't see the house, it plays a role - just not a helpful one.
The parts can add a lot of useful information, and sometimes there are things they rule, but you need to get an overall feel for the chart.