What does this mean?

I've been with my boyfriend for over a year and I really love him. I'm really happy with him but when my anxiety is high, I question everything. I tell myself that maybe were just not meant to be. Because it's every time I'm not feeling well I always worry about us or my feelings for him. I absolutely hate it because I really do love him and I want to be with him. We split for a week one time because we were both dealing with too much stress and we're putting it on each other. Yes, I realize that was bad but we learned a lot from it. Our relationship was more honest and trustworthy after that. That week without him was hell. Anyways, I know I don't want to lose him because I know how awful we both felt after that. But the feelings I get when I worry and overthink our relationship hurts so much and I'm really tired of it. What I am thinking is maybe it's my heart telling me something or I am just telling myself lies. I think we have a really good loving relationship so I just don't understand why I get these feelings. I want them to stop. If anyone could answer, please I would greatly appreciate it.