How do I cope with being away from my boyfriend for 3 weeks?

I always like to write down or otherwise notate good memories where I felt safe with my partner and revisit it whenever I feel alone

I agree with crohnsypoo, I used to be the same way, but I came to realize that spending time away from my boyfriend was freeing in its own way even though it was scary. Especially if you're introverted. Having some time to yourself can be really nice once you get past the stressful and anxious feelings. Try to view it in a positive light

Change your perspective on what being away does for your relationship. When you spend time apart, you become a more interesting person when you meet back up because of the experiences away that you'll have to share.