When was the last time you were happy?

When was the last time you were truly, abundantly, carefree-ly happy?

I was 9 months ago and I still am now.

9 months ago when I embarked on the journey with the BF, many of my friends( close friends/best friends) tried to bring me down. They poked holes in my happiness, they called me names, they labeled me a bad friend they basically put a big fat overwhelming wet blanket over my happiness.
I did not understand the reason behind it. And until today I still do not. How can you call yourself my friend when you envy my happiness?

When two of my close friend revealed over the last few weeks that they had found love, I was happy, no scrap that, I was ecstatic. I felt thrilled that they had found somebody. Never once did I feel left out or abandoned. Never once did I feel a tinge of envy that they were more likely than not be spending more time with this new person than with me.
Never once did I bitch about the fact that they may choose to be with their partners over me.
I just felt happy.

And when over the weekend a friend told me he had broken up with his fiancee of 1 year and girlfriend of 8 years because he had fallen for another, I cheered him on. I cheered him on because I know how it is to be with someone for donkey years and still think "Is this it?"
And to have "what ifs" with people we meet. He said he felt guilty as many friends made sure that he knew how selfish he was for abandoning something he had built for 9 years and decided to pull the plug and plunge his fiancee's life into darkness.
Is he truly selfish?
How is it selfish to think that his ex fiancee deserved to be loved by someone who can love her right? What is the point of staying together out of obligation? His heart will remain with someone else and he would not be able to love her the way she deserves.
And what type of friend would make him feel guilty for pursuing his happiness?
Not me. I am not that kind of friend.

We are all entitled to our own happiness. We should pursue it to the best we can.
At the first few months to my relationship, my mother vehemently objected to it. We argued and did not speak for a few months. But one day she told me :-

"You live your life for yourself. Not for me or your father. You are only answerable to yourself."

And that is how I intend to live my life.