You've created a story in your mind that when he's late it's because he doesn't respect you. That may not be what's happening at all. Maybe he just doesn't want to be around you or maybe he feels guilty and stalls or maybe he's just late. Who cares? It is what it is. Sometimes he's now late. I wouldn't say anything to him unless by his lateness he's causing some actual harm and then state it politely as a boundary and move on. Otherwise, it's just nagging and that's not what your relationship needs. If he keeps being late YOU can choose not to wait for him. That's all that's under your control. DB is a LONG process, if you choose to die on every hill you won't make it. Save your powder for more important battles.