Missionary writing!

Sydney • Mommy to one baby girl 🎀
If a missionary (that I may be interested in) doesn't write back to me for 3+ weeks should I send him another email or wait for him to reply to the one I already sent?
I just don't want to seem desperate but I do really want to talk to him! I'm sure he just gets busy with being a missionary and all, and also writing his family back so maybe he forgot to write me back? What do you think?!
(I emailed him once, he wrote me back, then I replied to that one and he hasn't written back in 3+weeks)
Extra info:
I know I sound like a little kid asking but I'm not lol, I'm 21 and so is the missionary. I just got out of a 3 year relationship so I don't know how to do these things anymore and am back at the phase of over thinking things like this. I haven't told him about the breakup yet, I thought it would come up but we haven't talked enough. I also feel like by getting emails from him I can feel uplifted. Idk is that silly?! But that's why I want to write him.

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