"I have not felt so lucky since I met you."
Maybe. If you mean that before you met me, you felt luckier than you do now, then that is one way to put it, but it is not very natural. "
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Maybe. If you mean that before you met me, you felt luckier than you do now, then that is one way to put it, but it is not very natural. But I suppose you meant something more like "Meeting you was the luckiest thing that ever happened to me."