I know how you feel bro and it sucks. Agree with everyone here that you deserve better if that is the reason that she lost interest. However, you should question yourself whether that is really the reason. We, as people who stutter, have a lot of perceptions and beliefs which are often not true. You perceived that she lost interest in you due to your speech, but there could be millions of other reasons (or she might not even be as interested as you perceived in the beginning). We often feel so much worse because of our stutter than it actually really is for other people. "During the day I did my best to not stutter" --> I've been learning about a topic called self-actualisation recently. Meaning that you show other people exactly who you are; 'what you see is what you get'. I always tell people (also girls) straight away that I stutter. It shows honesty and confidence, and could even make you more attractive. If they lose interest of that, good to know, they're not worthed to spend time on. If they stay interested, you know they respect you and they will appreciate your honesty. Besides, you have nothing to hide anymore and makes the fear of stuttering lower, which will improve your speech again. I know it's a long process to get to the point where you can confidently tell people that you stutter, but it helped me a lot. Feel free to reach out.