Hi again Nadya, and thanks very much for your reply with additional and helpful information.
Your ex boyfriend/fiance is a Leo, and typically, his strongest traits include being dominant, spontaneous, creative and extroverted. He can be strong-willed, confident and will often rebel against the status quo; he likes to be in a position of control/command. It might be that he seemed to get married after a comparatively short time after you were apart, which I understand is painful for you, especially after you were together for a long time. However, this behavior is not unusual for him. In many cases, he prefers to act first, and think it out, later.
He 'thinks' he's happy now, but there are some underlying problems which will become apparent as his marriage progresses. Considering the past you shared together, and the hurt you feel now, it would be best for you to continue what you're doing: don't ask any people you know in common about him, and if anyone 'volunteers' information, tell them you're not interested.
You still enter his thoughts, occasionally, and had some regrets about splitting up, but is too proud to dwell on that or admit it easily. He 'thinks' he has found the right woman for him, and married her rather hastily, but it's possible that everything might not turn out as 'perfectly' as he envisions.
I feel that you will be able to move forward in a positive manner with your life and find happiness in the near future.
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