I haven't posted before, but I'm at the point where I really need to know whether I am being unreasonable.

I want to preface this by saying I like older men, it is a personal preference. I would not be with anybody close to my age, as I'm very much attracted to the "silver fox" type.

My partner Nick (M, 61) and I (F, 29) have been together for just over a year. Fortunately, neither of us were married or had children when we met, and we connected instantly over our shared passion for animals at a wildlife rescue.

Things have been rocky since the start, as we have conflicting communication styles. My partner is the type to say things without thinking, which causes us to argue a fair bit. Nick was single for a long time, and having found a level of fame at a young age (19), he has been able to prioritise himself for the majority of his life with no responsibilities. Nick has never been married, and although he has had several longer-term relationships, I don't believe he has ever had a partner who will communicate their feelings so thoroughly. I'm aware that my tendency to take offence at his offhand comments frustrates him, and he regularly calls me over-dramatic as a result. This is why I need an external perspective, as I have BPD and could genuinely be getting worked up over nothing.

We have recently gotten into an argument regarding how we spend our time together. For context, everything I love to do relates to nature in some way, whether it's gardening, hiking, photography or birdwatching. My partner doesn't share the same enthusiasm, and I realised that up to this point in our relationship, we had only done things that align more with his interests (such as going to get food, watching films, or going to a car boot). He finally agreed to go on a walk with me last week, which I honestly really needed, as I had been trapped at my computer for almost a week (I own a business, and it was the financial year end). I was so looking forward to it when he arrived, so I got my puppy dog in the car, and we set off. To cut a long story short, I ended up driving home after several comments from my partner about not wanting to go and that I was prioritising walking over intimacy. Since then, I have explained to him that I feel saddened by his lack of desire to engage with my interests, and today he has told me point-blank that he is not going to do something that doesn't interest him. His view is that we should only do things together that we both genuinely enjoy, and anything else we can do separately. I would understand if I was asking him to jump out of a plane, but is it unreasonable of me to want him to join me occasionally? Also, I wouldn't mind so much, but even if I were to do these things by myself, he would be upset that I was prioritising my interests over spending time with him. He is also very suspicious by nature, so my going out on my own is not going to help his insecurities. I love this man dearly, and if I'm expecting too much from a partner, I want to know so that I can work on that internally.

TLDR: Partner doesn't want to spend time doing things that don't appeal to him, AITA for thinking he should want to share in my passions occassionally, if only to make me happy? Or is that selfish of me?