(B) is more idiomatic and probably is what you mean to say. (A) feels as if it may be trying to say something slightly different, perhaps that you would have been glad as a result of something that happened when you went, rather than merely glad to go.
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lucas21cIt is very difficult for me to catch the slight difference between (A) and (B).Could you tell me about it more?In "If I had gone to the concert with her, I would have been [adj.]", the adjective normally describes how you would have felt during the concert. An example that works OK is "If I had gone to the concert with her, I would have been bored", i