Not necessarily. However, the length of the conjoined phrase would make it easier to verbally state with a pause before AND, as well as using the second FOR. (The sentence is correct whether you use it or not.)
No, the second "for" is not necessary. The sentence can be rephrased as "Thank you for being part of my life and allowing our friendship to grow beyond casual company."
Example sentence - The concert was wonderful beyond our expectations.
beyond
Be straight and forward with them. You need to say "I think you are a nice person and I like your company, but I am married and do not want an relationship beyond friendship." If they cannot promise that, do not see them anymore. Just like you phrased it in your question. Be direct, be kind and be polite.
beyond
that word is beyond your your train of thought.
He lives far beyond my reach.
The grammar of this sentence is beyond phenomenal.
I think the reason is because you do have feelings for him but, they are just hidden within your friendship feelings.
The question was beyond comprehension.The character said "To infinity and beyond!"The house is just beyond that bridge.
If you swim beyond that rock you will be in the open sea.
Beyond the meadow of flowers, there will be a small village.
Don't go beyond the perimeter fence by your self.