Comhlánaíonn tú mé, means you complete me, you complement me....-note complement not compliment. I think this is the closest to what you want to say.
Foirfíonn tú mé, means you complete, (perfect) me, but it also means you mature, age me. That might be misinterpreted so I wouldn't recommend it.
kay
http://www.iol.ie/~sefton