DO YOU BELIEVE IN SOULMATES?

My ex and i broke up a little over three months ago. We had been together for a yr and eight months. The reason we broke up was because i was texting this one guy that likes me and my bf didn't like that(i can understand completely) and eventually he got the notion that i was cheating on him. He broke up with me and there was alot of stuff that went on and i remember him telling me one day on the phone in tears how his heart was broken and things like that. On the day that he broke it off, he sent me a text and told me "And dont forget that true love is forever, babygirl". Ill never forget that. I was so deep in love with him then and even though i have been trying all this time to get over him, i love him even more now. So do you believe in soulmates or something similar? I think he was mine, and do you think i should still try to win him back and how could i if so?