I saw him with my own eyes sweetheart. It's true though, Jamie's father did vanquish Voldemort a long time ago, but he has somehow returned in his teenaged form - just like Teddy's mother has returned in a younger form. The Aurors are still trying to figure out how and why this is happening.
Yes, I'll try to come home more but you shouldn't be too frightened. Just like I said before; be careful and there shouldn't be any worries... don't talk to strangers, especially ones that seem charming or full of themselves.
If you want dearest, you can come to the school anytime you like. You're my child and my office is secure - probably boring for you, but secure.