What do I do now that my ex said there is no chance for us?

i just texted my ex last night after a month of not talking "I'm sorry for contacting you when I said I wouldn't but I wanted to ask one more time if there is a chance we can work things out". and he said "no chance". so then a few hours later I said "you will always have a place in my heart. I love you" and got no response. although I expected the response I got, I still was pretty hurt by it. now, I don't now what to do. I by all means do not want to bother him or make things worse, but I truly love him so much and wish he could see how much I've changed. so, what do you do when you love someone so much? do you keep fighting to show them you love them, or do you just give up the fight, which in my opinion shows that you never loved them?
What do I do now that my ex said there is no chance for us?
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