They seem to have other things on their mind
You shouldn't be competing with a phone, the football game or their friends for your date's attention. If even one-on-one they seem to be more interested in external factors, it's a clear sign that they just aren't that into you.
"If a person is on their phone or not interested in the conversation, they are looking for a way to get out of the situation and to do something else," Perry said.
Try to organize a date with few distractions as a test, since they may not even realize they're doing it. But if you still feel like you want to wave a hand in front of their face in order to notice you, they're not feeling it.