Seems like you have still not gotten over your 'ex'. The reason you like the 'second girl' is because she just reminds you of your ex. So deep down, you still have you ex in your heart.
No worries. Dont feel guilty for that. Humans have a very soft heart and some people make a lasting impression and it can be very very difficult to forget him/her.
But there is hope. 
First start with the mission of COMPLETELY getting over your ex. Remind yourself time and again that she is married now. You don't want to be thinking about another man's wife, do you? Do what you like. Hobbies, catching up with old friends, boys only party, helping poor (Helping someone in need is a real joy you know?), working/ studying hard, trying to be top in whatever you do...
Just do what it makes to get you back on track.
I understand that advices are very very great, but very hard to implement. But make an effort to do it. Its for your good only.
Once you have gotten over your ex, and your mind is clear.. then sit and really think over whom you really want. Please don't make rash commitments.
Ask yourself 1000 times you who really want.... i am sure you'll get the answer. Human mind can get very confused if we deal it on the surface level. You really need to ask yourself very very deep questions to find out what your heart really wants.
Once you are clear, you can pursue your heart's desires.
I usually submit my feelings to God when i am confused or desperate. When i do so and give it time, a clear answer will come over time. You can may be try it.
Will be praying for you. TC
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