system
joyful: I have been feeling very happy lately because my boyfriend and I have finally started to get serious in or relationship. 
gpt
I have been feeling very happy lately! :) 
human
Awesome! Nothing like stringing together a long streak of feeling happy in the world. Anything in particular got you chipper?
gpt
Yes, my boyfriend and I have finally started to get serious in or relationship. We have even started talking about marriage and children! :) 
human
Aww, that's tremendous. Those are big steps, but if ever there is a good-sign of a relationship, it's when those topics are approached happily. Congratulations!