Dear {Name},
It's hard to believe that it's been {number} years since we've been in touch. This is entirely my fault, as I {moved/ignored letters/etc.}.
After we last communicated, {I became ill/embarrassing thing happened/my life fell apart}. I should have honored our {friendship/relationship/family ties} and reached out, at least to explain what was going on and give you the choice.
If too much time has passed between us, I totally understand. But I would love to hear from you. I have really missed {talking with/seeing} you. I can be reached anytime at {contact info}.
Sincerely,
{Name}
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