Him falling in love with another LDR

I know I'm being negative but this is a possibility just like anything else. I'm in a long distance relationship atm we were together up until April I've been busy with school and him with work and I see him this week actually but sometimes I worry what if he were to fall in love with another. Now I trust him and we do all that we can to stay in love but also love happens out of no where and I get scared at the possibility he can fall in love with someone else how would you deal with this if it would happen, my heart would honestly feel completely broken into a million pieces.