Absolutely. You can enter into a mutual protection pact with a civ, for example, without entering into a right-of-passage pact, or vice-versa. The idea is that you can "mix and match" your diplomatic agreements to suit your play style.
Yes. To engage in diplomatic talks with another civ, you must first make contact with that civ. You can do this either by physically entering their territory or by trading another civ for contact with that civ. Other Civs may also seek you out by entering your territory. You also need to establish an embassy (granted by the writing technology) to be able to enter into agreements more advanced than simple peace treaties. To be able to enter into trade negotiations with other civs, you need a road connecting one of your cities to one of their cities. To exchange world maps, you need the technology of map making. Finally, you must be at peace with a Civ to tender any proposal other than a peace treaty.
Yes. If you continually abuse your relationship with other leaders, they will be less willing to trust you during negotiations.
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