No sex, no dates, no plans nothing to look forward to literally nothing. Each Saturday evening he asks me what I want to do on Sunday and my point is I like relaxing Sundays, coffee, papers, chats, morning sex, breakfast, not on the clock getting out of the house into the woods in trekking gear. I'd like art, music, leisure, lunch. I often want to say I want to be on my own but I can't so we end up going for the same walk each Sunday, not talking much and me hiding tears behind my sunglasses.
Aside from what a financial user/exploiter he sounds to be; you don't actually seem to have much in common at all. You've described how you'd enjoy spending your weekend, it's nothing like what he wants to do/enjoys. There are plenty of men who'd enjoy what you enjoy. I met a pleasant man on a train journey once who told me the biggest advantage for him in living near Birmingham was easy access to lots of theatres etc. Likewise coffee, breakfast in bed, chats, sex - would be plenty of men's ideal Sunday too.
And I know lots of women who wouldn't like the Trek's or the camping either.
You're being dragged on treks you don't enjoy because you "can't" say no ... Why? Why can't you have the least bit of say or assertiveness about what you want to do with your precious weekend?
Because he'll huff and make you very uncomfortable & unhappy (and you apparently can't get rid of him due to your temporary circumstances?). I don't know what they are but you desperately need to resolve them.
The fact that you feel you can't say no to him (and go on walks while crying behind sunglasses) is concerning. A very weird and unhealthy dynamic.