To me, there are different groups of friends, like everyone else, grouping people they know into categories and interacting with them as according to the groups they're in.

Acquaintances - People who I know they exist and they know I exist. Conversation is very minimal.

Friends - People who I keep in contact with who are not very often but still, we know a lil' of each others' information and stuff.

Good Friends - People who I would talk to every nowandthen, maybe meet once in some donkey years.

Close Friends - People who I would share my thoughts with. People who I would usually talk to maybe almost everyday and meet up whenever the oportunity arises.

Buddies/Brothers - Guys who I will really give my life for whenever needed. People who I've nothing to hide from. People who know me (almost?) inside out.

Regardless of all these groupings, anyone who calls me to ask for help, I would do whatever I can within my ability. I would always tell them to call me anytime. My phone will always be switched on 24hrs and I will do my best to wake up even when 3 or 5am.

It is only human to err.
The last thing I would ever want is to bastard anyone or lie. Maybe along the road, I did things that you think/feel that I shouldn't have, if you know me well enough, you will know I would never mean to hurt anyone. Tell me straight in the face and I'm sure thing will work out. Even at the slightest doubt, just raise your question. Even when clueless about what question to ask, just raise the topic. I would apologise if I'm wrong even though I do not believe in apologies. Action does speak louder than words. Right the wrongs not just apologies.