I need someone to read this

I started watching this movie in English called ‘Fences’ and in the movie the husband cheats on his wife of 18 years. It got me thinking, you can devote your life to someone and they could still betray you. I was cheated on my freshman year in high school. I’m now dating a great man for over a year. I’m scared, I’m scared I’ll lose him to another, I’m scared he’ll wake up one day and stop loving me. My mom told me my grandpa cheated on my grandma after twenty years of marriage. I idolized their marriage because of how long they were together. My parents were divorced, my grandparents on one side are divorced, my aunt is divorced. I’m scared I’m gonna end up like the rest of them, betrayed, alone, and afraid to fall in love. My grandma stopped believing in god when she got cheated on. I don’t think I could handle that betrayal, I don’t think I’d survive it. I love my man with all my heart but I will always be afraid. I trust him, I’m scared that one day I won’t. How do I do this? How do I love without fear?