Did you have something else to talk about in your current relationship? Or like your own interpretations about this map?
Please, let us know before judging the map, because that's how it works [horary] in this forum.
I think your intuition is right. Jupiter square Neptune in 3rd (He's trying to dissolve communication). He may be influenced by mother or something home related. Mercury at 14 degrees plus Neptune at 14 says to me that your communications are hazy and unclear. I think it might be his mom influencing him (Chiron/hurt at 28 degrees/Mom in Pisces/behind the scenes).
I feel that he is trying to avoid me by putting many difficulties(being critical, his mother got mad at me for nothing which is suspicious, doesn't call or talk to me anymore social media much, he wants to meet less, less sex too, jesus.
This is always been the case to me why I switch to sidereal. Problems are communications and sex.
Please, note his significators descendant in Gemini and Mercury detriment in Sagittarius [communications].
Your significator ascendant in Sagittarius and Jupiter is in Scorpio [sex].
Conclusions: Jupiter and Mercury is not in aspect at all. It is the best way for both parties to slowly end the relationship. But if you want to give a chance, it is you decide.
Wishing well.
R
In the sideral mercury will be in jupiter sign, Sagittarius, suggestioning an admiration from the mercury person to the jupiter person. Would that be possible? I'm not sure Saturn in 1st makes an horary chart still valid.
It's obvious his mother is a huge influence on what's happening. Is she foreign? I see some indicators..
I see your passion, Jupiter in Scorpio and oh XII from Asc. I already said his significators Mercury detriment in Sagittarius in the Asc. Both significators is not in aspect and your conditions in XII is not good, my friend. But again, this is your choice to decide it.
Good luck
R
Would the reason be some insecurity in sex or a third party?
I'd say a female friend might be influencing, perhaps.
I had an issue with a guy I was dating and he was very close to his mother but it was too much. I made the decision to break up with him one day when she would insist on calling regularly around the time I would make dinner and he would talk to her for an hour until the dinner got cold. It was one of a few signs for me that I didn't matter as much. Years later, I have had no regrets. Life is complicated enough without having to compete with someone in your relationship.
What I know is XII is associated with hidden, so you might the one who hidden something from him. Your significators is sitting there.
I think I will finally leave him.