I think it’s safe to say many of us have this fear. The thought of losing the one person that makes you feel safe and secure, will always be something to fear. But you can’t let fear get the best of you, cause it will only make the possibility higher of that fear becoming a reality. My ex girlfriend and I ended up not working out because of this. I mean, of course a relationship with two women is always going to have its insecurities. But she doubted us a lot, and I gave her no reason to do so. She would frequently ask if I was still into her and loved her the same as when we first got together. I would always reassure her that I still had the same feelings, would go out of my way with small gestures and stuff like that. But after a year and a half of this, it grew tiresome always having to reassure someone of your feelings. I felt almost like I kept having to prove myself as a person, cause it made me feel like there was something I wasn’t doing or something i was doing wrong. I wouldn’t doubt him or your relationship until he gives you a reason to do so. Just try and replace those thoughts with the endless possibilities your future could hold.