Hi JT,
Thanks for coming here and trying to understand and help your boyfriend. This shows you have the heart it takes in order to help him with this problem.
I have been married for 25 years now, and my wife is a wonderful person, but POIS has to be managed properly, because it can become hard on the feelings of a woman who is in relationship with a man having POIS, in particular when he has not found yet anything to lower his symptoms.
Like you have mentioned, having sex but stopping before ejaculation is useful. It is one of the way we have used through the years in order to keep an active sex life while not compromising 2 or 3 days at work for me, and not hurting too often the emotional aspect of the relation, as I was transforming into an aggressive, jerky, anti-social and anxious person while in POIS, for about 2 to 3 days ( it is no longer happening now, but it has happened for years, before I have found ways to reduce my symptoms).
Having lived with POIS for about 37 years now, I have found things that help reduce my symptoms a lot, as I have just mentionned above. Just see my own method at
http://poiscenter.com/forums/index.php?topic=2090.msg16604#msg16604 . You will notice that there are some basic measures, like healthy food, but some more specific supplements that helps me when taken some time before ejaculation. Your partner may glance some ideas on this forum and may find some safe, useful supplements and ideas that would help him get a significant level of relief. Nothing so far works for every POISers, but among all the suggestions here from different members, he may find something useful for him. Current research on POIS will hopefully bring a better understanding and better treatment options, but for now, members sharing what works for themselves is the best info currently available.
What NOT to do, has a female partner, is forgetting about the sensitive and lovable person your boyfriend truly is when he is not in POIS. When in POIS, most sufferers undergo a personality change, not unlike Dr Jekyll and Mr Hide, or Bruce Banner, vs Hulk... So, remember, in those difficult days of POIS, that this is not who he truly his, and be patient, and, stay at safe distance, also, so to speak ( I have been so mean to my spouse, sometime, when in POIS...but was not myself, and suffering a lot). As some ways to lower the symptoms will be found, the duration and severity of POIS will diminished, and so the temporary but forced "distance keeping".
Remember, also, that you are not causing POIS in any way. Your boyfriend loves you as you are, and POIS, usually, was there long before he has met you. It is not that you are not this enough, or that enough... it is just a personal condition he has.
About the close moments just after sex, what is his onset time, the delay after ejaculation before he starts to have symptoms ? For some, it is quite instantaneous. Luckily for me, it takes a couple of hours, so those intimate moments just after sex are possible.... Check with him, to know exactly how much time it takes for him to start having symptoms, so you can have maybe that short time span with him, before taking a distance. If it is instantaneous, you may have to let go, or experience these moments when having sex without ejaculation at the end. At first, my wife had a strange feeling of incompleteness when we first tried that, but after a time, she was so happy with me not becoming aggressive, irritable and exhausted for 3 days that she got used to it, and then didn't noticed anymore after some months.
Wishing the best to both of you!