I know nothing in life is guaranteed.

I have nothing to fault my boyfriend for. But the thing is that the more I fall for him the more I feel I have to lose. I was very happy and secure before I meet him but now I'm starting to feel insecure and sad about losing him. I want to note that literally nothing has happened for me to think that will actually happen soon and I know I'm being illogical.

Has anyone else had experience with this and could you share what you did to put yourself at ease and curb your fear/anxiety besides seeking therapy?