How to Get contacted by my friend & his sister (with whom i unknowingly misbehaved)?

I must say that i'm still using a Obsolete brain with no idea about today's World. I had never even talked to a girl who i don't know. but 1 day my orkut friend chatted with me in Google talk. As a joke i used his first question which he asked me when we met for first time that "Are you male or female?" got a reply 'female'. then i asked name. the name came as reply was very much similar to my friend's name (with a single letter change). then i asked "Did you had sex change operation or what?" and got a reply "don't use such a language". Then i just understood that she is really a girl. As i had so many flashbacks that how Many Women had ruined my life, just to avoid her i talked to her as a Casanova and made her to sign out. after confirming that she had signed out, i was typing sorry and explaining that how i had worst memories with women and just then she signed in and caught me and started typing as that she enjoyed my language. I had frustrated and abused her in the worst language (just to make her aggressive on me). But she in very cool manner replied to me.Then with a doubt i asked her who sent me friend request. she replied her brother and its his acc id. first i thought that what would he think when he see this chat that i'm abusing his sister? then i remembered that i used to get mails in my friend's name saying he had invited me to a site where you can flirt people (that was like queposa.com or something and i had ignored it and said to him that i was not interested because of its WOT search's poor reputation). Then i thought that may be he is trying to make me join in that site.Till now i hadn't made a single call to any of my friend and also feel little strange whenever anyone (also when her brother) asked my contact no. i don't have a personal mobile and even i use mobiles for camera and internet purposes only. she gave her no. and asked my cell no. after a little hesitation i gave her no. to call me immediately and never disturb me. and took a promise that she will disconnect the call after 50 sec. (just 2 get clarified that is she is really girl or is my friend is playing with me.) immediately i got a call but that became missed call. with an irritation i had scolded her poverty and asked do i have to wait or go away? Then someone answered ( seemed 'to be' rashly).. "Who are you?" and Then for a few sec i had shocked and with a conformation that she is really girl and he is may be my friend or his dad, without any hesitation i started "I'm orkut friend of (my friends name). today his sister had chatted with me and (said all the above mentioned things and ended conversation with) i think its better that you all make her join in mental hospital." for a while i was very happy that "being a girl she is playing with me? i taught her very good lesson". But after a while realized that "what wrong do she did 4 me to make me talk so excessive? What's such a big difference between boys and girls that i used 'being a girl?' why didn't i barked in the same manner with her bro when he asked my no.?" and started typing an offline message to my friend that whatever had happened is just my fault and explained everything. next day morning i saw him online and by hiding all my emotions i asked him "who did chatted with me yesterday?" In a very dull mood He replied " i think.. my sister" then i got to know that he was absent yesterday and one who replied was his brother and i myself was publicizing a small matter with a double meaning word "Abuse" where i mean to say 'Treat badly'! and by covering my downhearted expression, i tried to change the topic but he signed out. and till now he didn't signed in. I had tried to call him and even his sister but there was no answer. he had switched off his phone. This is not first time that i lost relations with people because of my worst language. And had also felt happy to break off from them.But this is the First time i felt guilty for what i had done. till now i don't have any online friend except him. all are school or family friends. i liked his personality as light taking and jovial person and the same can be seen in his sister. from my childhood no one let me talk (not interested in listening to me) and whenever i tried to speak out, all had forcibly shut my mouth.but he was the first to let me talk. If being too frank minded is the problem with me, then i'm even ready to break off my head! because i'm tired of being the victim of hate. I don't want to loose his friendship. Is there any chance to get contacted by him?