<human>: Hi guys, I have been reading this subreddit for the last month and I was wondering if you could help me move on with my hearthbreak.Sorry in advance if there are alot of mistake, my native language is french and this is my first post ever.

See I dated my ex-girlfriend for almost 3 years. We both were our first love and our first everything. Our couple was doing perfectly fine until she got a new job at the local gym. She started to be more distant and started to say that she didn't know what she wanted anymore. The last 2 months of our relationship were horrible. She did not want to make love anymore and didn't want me to go to her job. She took a break then proceed to broke with me.

3 weeks later, she started to date her gym trainer there. I am not dumb, I knew she was leaving me to date this new guy. She gave me the classic crap '' I see you as a friend now'' but I still can't get over it. This new guy is the complete opposite of me. He is 5 years older than her , he has a car ,he has his own place and he's working full time . Me and my ex are still both in college  and we would do simple date like going to small coffee place to study while he brings her clubbing most of the time. Now that she is with him, she left her field of study to study what he did, she left all her friend that didn't support her decision and she is not talking to her family because they told her it was a big mistake. 

At the very least, I was able to keep myself from begging her to come back and went no contact for a good month now.

My question is how do I get all the obsessive thoughts about her coming back to me out of my head and how do I move on?

Can you summarize the given text in a few sentences?
<bot>: My ex left me for her gym trainer and I'm stuck in my basement thinking about all the possible way of her coming back to me.