I'm still thinking about my best friend

Back in January I posted this because I was situationally depressed:

https://www.isitnormal.com/post/i-m-clinically-depressed-and-it-s-my-best-friends-fault-279269

I'm posting again because I have seen him since, met his girlfriend, and I'm still thinking about them. In my first post, I mentioned that i don't want my best friend dating and that the girl he is dating happens to be with is my therapist's daughter. Since then I have changed therapists because i could not stand the fact that my therapist would tell me nothing about them. They are all Catholic, and I am working on it and trying to believe it. The last time I saw my best friend was on march 23, at a catholic youth festival. I bought tickets there just in case he would be there because he has been in the past. I had not heard a word directly from him since May 8 of the previous year, so i didn't know if he was going. When I got there, I eventually found his mother and she told me that he was there, but she didn't know exactly where. I went searching the grounds for 30 minutes. At one point, I was calling out his name because it was so noisy. I was so frustrated that I bent my toe down in my shoe, and injured it. It still hurts today. When I found him he was with the youth group including his girlfriend and her siblings. My best friend seemed happy to see me, even though I was ignored for about 10 months. I introduced myself to his girlfriend. I didn't do it immediately, but he didn't seem to know that I hadn't met her. I introduced my self by saying that he is my best friend. I didn't say that I am his best friend because I didn't know what she would think since she had never known I existed. She didn't seem to mind. Her name is Grace, and I will mention that more later. Throughout the entire day I could tell that they are in a serious relationship. I have never dated anyone before, but even I knew it was obvious. They were holding hands, sharing a snowball, sharing a purse for their belongings, cuddling. They had only been together about 7 months at that point! My best friend had not dated since 8th grade and this girl is 3 years younger than him, he is 22. I just don't see how this could happen so soon between these 2 people!!! He had like no real dating experience and now it's serious! The most disturbing thing was that they took a walk alone together before mass. I saw him take out a satchel that looked like it could have jewelry in it. I'm sure that they made out at some point during this walk. I heard nothing of a proposal and did not see any new jewelry on Grace when they came back. I have no idea what he gave her, but i have been thinking about it recently. In August they would have been together for a year, and it's going to hurt. My best friend left college around this time and told many people that he planned to return this fall. He lives further away than he used to and i fear he may transfer colleges. I only want him to go to MY college. I need to be with him!!! I haven't heard from him since he texted me for my graduation. I'm going back to college so that I can see him again. Regarding the rest of the youth festival, when I left, I told his girlfriend that i was nice meeting her and she said the same. I fear a proposal could happen during the middle of August, but I have no idea if it will really happen. I have been monitoring all facebook accounts associated with him and his girlfriend, her mother, and family, just in case. I'm not friends with any of them, and my best friend does not have a facebook, i just took at what's public. Some of these profiles are more open than others. IDK what I'd do if i saw a proposal, I'd probably go into a worse depression. I've been praying to God that he's at least not engaged or married when I seen him and that he returns to MY university in a month. Just hearing the word "grace' is like a needle in the heart. Anything worse is a knife in the heart. I hear it a lot because my family watches religious programs. I want to be his best friend and the feeling be mutual. I'm really looking forward to seeing him on Tuesday and Thursdays this semester, which is when i have classes. If he's not there with no hope of returning, I don't know how I will function. I may drop out and work full time and my grocery store to try to get over it, but I doubt that I could. I have been thinking about him 24/7, 365 since. I know that it's an obsession, but I feel that i can't help it. He's by best, first, and only friend in my whole life. I know it's not normal to be this obsessed but i still want everyone's opinion. Please let me know what you think and at least pray that he will be on campus next month!!!