<human>: Hello, I've been engaged with this girl since we were both 17 and 15 yo. We definitely had our good times and I'll always hold special memories of her. 

But you know how it happens for first relationships, we both didn't know what we wanted from a partner, and one day, out of the blue she told me she didn't love me anymore. 

That was 6 months ago. I've been trying to improve my life so far, cutting all contacts, meeting new people, hitting the gym, getting better grades and finding a part time job. Great isn't it? 

Thanks to the help of a good friend of mine I've met another girl 2 months ago. She is sending me signals that he's interested in me. She's also very kind, a bit quiet and never been engaged. I started dating her one week ago. We both kissed yesterday and that's when hell started for me.

This night I couldn't stop thinking about my ex-gf. Thoughts like: I've cheated on her, I am not good enough for this girl, I'm giving her false hope and so on...

I know it's over, she told me it is, I should get over it but I feel so emotionally invested in her that I can't enjoy the company of the new kind girl. I feel like I'm letting get past me a good opportunity to definitely forget about my ex, but this girl is so into me and I'm scared she could see me through and understand how i feel.

Can you summarize the given text in a few sentences?
<bot>: Broke up 6 months ago with ex-gf, still love her and can't enjoy the company of another girl I met.