The delineation is ok. The purpose of the forum is to learn, that is why everyone "should" provide a basic interpretation, so others can help delineate the chart. There is no need to be shy, no one here will judge.
Anyways, going to the chart:
You = Mercury (ruler of 1st) / Moon (co-signifier).
Him = Jupiter (ruler of 7th).
All your planets are in Cancer, the exaltation of Jupiter, so you clearly into him. His planet Jupiter is, showing no reception towards your planet. This isn't good.
Here is the problem with the chart: Jupiter is placed in the 12th house. This house signifies things that are hidden from the querent. It mostly implies that he is keeping something from you, or something that you are unware regarding him.
However, Jupiter is slowly moving into the sign of Mercury (Virgo), and the first house. This is good.
In my opinion, he is currently not really into you. He is mostly interested in the sexual side of the relationship. This is backed by Jupiter being in Leo, the sign of the Sun and ruling planet of men in general. This may imply he is just looking to satisfy his sexual apetite. This could also be the reason it is placed in the 12th house...because it might be unkown to you.
Also the fact that the Sun and Jupiter are in mutual reception, also reinforces this.
Whatever the Sun means, is what is being kept hidden from you. The Sun could be representing another woman in his life. Or his "male" side, being his only interest. Honestly, its hard to pin point the specific meaning of the Sun, but clearly because all his interest is directed towards it, that is defintly the problem.
You've mentioned you just recently became "monogamous"...are you sure he isn't still seeing someone else?
But as I said, Jupiter is moving towards the sign of Mercury, which would signify a change in his perception of your relationship.
So personally I do not think you will break-up, at least not from his side.
But the chart definitly suggest something is going on, given that his significator is placed in the 12th.