Yesterday morning, I asked my partner whether one of his friends got married last year - he had said mid year that his friend was getting married after the summer. I had heard nothing since and it popped into my head - thinking oh did the wedding actually go ahead. He said, yes I went to the reception. Unbeknownst to me. That weekend, he had stayed at his brothers house which is a 3/4 hour drive to this wedding reception. His only child also attends university about 20 minutes away from the venue. He only told me he was driving up to spend some time with his child. I had no idea about that being the reception/wedding date. He reserved a hotel when he got the invite (which I never saw) and didn't say that either. I was incensed - and frankly incandescent - so much that I hopped in the car drove to get a coffee and some fresh air. He had been staying at mine whilst he had appointments in town - His current situation is rather chaotic. He separated from his long term partner 18 months ago and moved out of the house definitively in October last year. For the past 6 months he has stayed either with his family or with a set of friends house-sitting as they travel quite a bit. He has looked to get his own place but that is still awhile away - and also he will have to put this jointly owned property up for sale in the next 12 months. It seems to me he likes to separate and compartmentalise his relationships. I have never met his child - nor any of his long term friends nor his family members. As a mature woman (formerly married) I find his behaviour, and secrecy very very odd. He seems to think he has done nothing wrong. Oh I didn't mention the difficulty I also have as the friend who got married is female and her close friend was in a casual relationship for many years with my partner, whilst he was living with his former partner - and naturally was present - with her partner at this wedding reception. I just find this odd and am reconsidering this relationship. He is panicking and wants to go to couples counselling to discuss - as he doesn't understand why I am so incensed. Am I being unreasonable as I feel like I'm being asked to accept what is frankly unacceptable. He also said the invite was only for him - and that (conveniently) the invite was part of the whatsapp messages that were lost when he upgraded his phone.