154In that regard, it has also been held that the principle of observance of the rights of the defence is particularly important where, as in the present case, the decision not to renew the appellant’s contract of service was adopted against a background of poor personal relations (see, to that effect, judgments of 3 June 2015, BP v FRA, T‑658/13 P, EU:T:2015:356, paragraph 51, and of 12 May 2016, FS v EESC, F‑50/15, EU:F:2016:119, paragraph 114), whilst bearing in mind that the question whether there has been infringement of the right to be heard must be determined having regard to, inter alia, the legal rules governing the matter in question (judgment of 10 September 2013, G. and R., C‑383/13 PPU, EU:C:2013:533, paragraph 34).