Stupid dreams

How do you get over a dream that is completely stupid and not going to happen? Said dream being that like most of my family and friends, be engaged by the time I graduate. Well neither of us have jobs, and we have less than 3 months before graduation. I told my SO my dream when we were together for about 5 or 6 months. We’ve been together for over a year now. I don’t think he wants or is ready for commitment like that, seeing as he always hides his phone when he talks to another female and has to go hide to make phone calls to her. It’s only her. I’m getting to the point of disappointment to when it’s a depression state and I’m going numb. I spoke with him a few months back about my dream and he just brushed it aside. I don’t feel loved like I used to be anymore and seeing everyone post their engagements and pregnancy announcements on social media just makes me want to turn off my phone and crawl in bed alone...please someone give me a coping mechanism..