I get in my head a lot(23m)

I’m out of town for work for a couple weeks at a time just for the summer and my gf (20f) yesterday said she’d text me today i texted her good morning at 12:51pm (11:51am her time) and she didn’t respond until 5:32 pm

She said she missed my text since she was at church but when I texted her, the church service was over so I wonder if something’s wrong, she is good at communicating but we’ve talked less yesterday and today

She’s typically busy with family on sundays and I was hoping to talk to her more today ,I get super down and in my head when she doesn’t respond for long periods of time which may be unfair of me to expect her to respond fast to my texts

But I don’t text her too much in a day like I’m not spamming her or anything, I think she just has stuff going on but I was super lonely and sad today

I get to see her next week though Sunday the 29 or Monday June 30 so that’ll be nice after 2.5 weeks

But my therapist said I’m wearing a mask, hiding my needs and seeming happy when I’m with her but when I’m not I’m sad and thinking about all the what-ifs

How do you stay happy or positive when youre away from your S.O. or just lonely like I’ve been today?