Plot twist: his attempts succeed, but the girl turns 35 and refuses to marry him for whatever reason (figures it out, just goes back on the promise because she doesn't love him that way/ decides she doesn't need a man to make her life worthwhile, etc)
I run my hand over the fresh bruise on my arm. "I must have a particularly clumsy soul mate. I get hurt so much it's ridiculous. My soul mate must hate me cause it's ridiculous how many bruises and cuts i get.