Perennial Sweetpea

I have a perennial sweet pea (pink flowers) but don't know where it came from, possibly an escapee from next door. It is tough and leathery and competes with bindweed for thuggery. I cut it to ground level each year and it always comes back. I do try to train it up a dullish shrub but it's tough leathery stem makes it resistant to being told what to do. It just wants to snake along the ground. I would stick with the more biddable annuals!