Worried I lost my soulmate

I only dated my ex for 5-6 months. He was genuinely the best thing that ever happened to me. I was his first girlfriend and he was my first boyfriend. We spent the summer together, went to cute beaches, bought each other gifts that reminded us of each other. He broke up with me because he said he mentally can’t be in a relationship and give me what I deserve. He looks so much happier now that he’s single. I miss him every day and cry every night because every part of me misses him. It’s been 3 months and I just don’t know how to live without him. I’m in college and everyone keeps saying I have time to find my husband but I only want him. I could use some advice on getting over that first heartbreak.