>>33249062To piggy-back off this-
If you match with a girl or meet a girl IRL and you try to set up a date but she says she isn't free until the following week(s), there is a very high chance that you're just not on the priority list. Pretty much every girl that has either A) said they were busy until next week or B) won't be arriving for X amount of weeks, we never ended up meeting.
Maybe out of 20 girls that have said that to me, I've only met maybe 3.
>>33247470 (OP)You leave out a lot of context in your post. You have a date in 3 weeks but you've already been seeing each other once a week. For how long? If you've been dating for awhile, then 3 weeks isn't a big deal if you're both busy. The longest in between date time for me would be about 2 weeks because I had to go home for a week and then got sick. She was the one to keep and initiate contact with me.
But usually the more time between dates the chance of her finding a reason to not go out with you. UNLESS she is so undoubtedly attracted to you that the time apart only makes her more excited to see you.