"to rush things" means to do them in a shorter amount of time than seems wise. It is generally used in two situations: LOVE / ROMANCE Here, it is an expression that feelings and physical intimacy grew too quickly for the time period. In other words, the two people only knew one another a short time, but quickly began to spend all of their time together, being sexual, etc. Someone may say, "Maybe we rushed things", if they begin to feel awkward or afraid of this at some point ("Oh my God! What am I doing! I barely know this person!") or if the other person is being too dependent and calling all the time. WORK / BUSINESS You will hear this phrase if a project, business relationship, promotion, etc. happened quickly, but now, people are having doubts about the decision.