Faramir and Eowyn: Was Tolkien just pairing off?

I think the relationship between Eowyn and Faramir was very sudden.The message that came across to me was that Faramir was very much in love with Eowyn, but I felt she was just deppressed that she couldnt get Aragorn, so she just accepted Faramir.It seems to me as if Tolkien maybe hadnt planned it, he maybe just stumbled upon it and thought, hmm they go well together.