You don't need to worry about the relationship or a many girl. If him really loves you, him will still remain. It's up to you, but if him left you. For me you can let the him to go. Because it's not worth it for you. Please believe in a relationship if you are important to him, him will still remain. Don't be a beautiful girl's just face. But be a beautiful girl from your brain. And you be a girl worthy enough for someone who suits you.
And I'm bored with the same story, I wouldn't say it again. I hope you can understand.