Boyfriend Stress - Long Distance

I’m finding that my boyfriend is a major stressor in my life. Right now we are tying to do long distance because we are both at separate colleges and I am buckling underneath the weight of it all. I’m not unhappy with him and I love what our relationship has to offer, but when we fight or something goes wrong it often affects my schoolwork and how well I do on tests. I feel this immense pressure rising on me and I don’t know what to do. Please someone help.