When do you use reflexive verbs? Do I need the reflexive pronoun for every action did by myself?
1. Nous ne mangeons pas souvent ensemble. (We don't often eat together.)
2. Tu as assez mangé? (Have you had enough to eat?)
3. Je ne mens jamais. (I never lie.)
But why: 4. Tu ne t'ennuierais pas tant si tu allais jouer avec les autres. (You wouldn't be so bored if you went to play with others.)
I did not get the difference between number 1&2&3 and number 4. They are both actions did by a person or a group of person. However there is a reflexive pronoun in number 4. So when should I use reflexive pronouns? Do I need the reflexive pronoun for every action did by myself?
Thanks a lot for helping. Waiting for responses.

Question

When do you use reflexive verbs? Do I need the reflexive pronoun for every action did by myself?
1. Nous ne mangeons pas souvent ensemble. (We don't often eat together.)
2. Tu as assez mangé? (Have you had enough to eat?)
3. Je ne mens jamais. (I never lie.)
But why: 4. Tu ne t'ennuierais pas tant si tu allais jouer avec les autres. (You wouldn't be so bored if you went to play with others.) 
I did not get the difference between number 1&2&3 and number 4. They are both actions did by a person or a group of person. However there is a reflexive pronoun in number 4. So when should I use reflexive pronouns? Do I need the reflexive pronoun for every action did by myself?
Thanks a lot for helping. Waiting for responses.

Answer

I'll give you some examples: "Tell me something about yourself,  I wanna know more about you." 
"I don't like him. He only cares for himself." "I'll have to look after those kids , cause they can hurt themselves." etc. In all languages, you use it only for actions and deeds you've done personally and those actions that can have an influance on you, but only those you do yourself.

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