Stay or go

I’m 70 my partner is also 70 . We live in the South and I have a property in the North which I rent out. My tenant will be going next year . My partner owns the property which we have recently moved into and will be leaving all to his children. I have asked if he could arrange so I can stay in the house if he dies before me . He doesn’t want to marry and so far has not made any provisions for me . I don’t fancy being turfed out of the home if he dies first. It’s making me very resentful, I feel I should leave while I’m still fit enough to start a new life some advice required from wise ladies please .