i need advice and tips on how to stop over thinking 😕

so since my boyfriend has been back to work I feel a little distant. I can't tell if its me over thinking or if its actually happening. normally in the morning on his way to work he will text me and then will say he loves me and keeps in touch with me through out the day and he normally calls me while he's driving to different jobs, but lately he hasn't and it makes me scared that he's loosing interest in me 😧 not really sure what to do cause I'm sure I'm over thinking but we hardly keep contact during the day and when he gets home he's just on his phone. makes me feel like I'm not good enough anymore. I've been feeling like this for about a week since he told me that when we go to his work Xmas party to say I baby sit so I dont embarrass myself in front of anyone since I don't work. I'm very lost at this point . please help