what did he mean when he said one of these days?

k so i talked to my ex’s mom today (it was her bday so i was callin to wish her one) anyways she told me that they had asked him if i was comin to dinner with them and he said cause we’re kinda not talking right now which is true…its been a week since we talked on the phone but i talked to him at work sat and sun wen i saw him. but he really wants to focus on summer school so he can graduate already.he’s about to turn 25 but he graduated back 2004 so he really really wants to get school out the way. since its been a week since we last talked on the phone, i thot maybe it really was it, but his mom me he told them that i was gonna come over again one of these days.wat does that mean? i know he misses me cause he told me.his mom said he wasnt talking as much at dinner which sooo isnt like him especially if im there. and another thing.if we keep going on like this and not call or txt each other, wont he miss me less even tho i see him at work like once a week? i really wanna just pick up the phone and call him but i want him to have his space. we were together for 2yrs..known him for 3. last time we talked he made me mad and i told him “i dont care anymore..fvck u, good nite”. even tho i talked to him at work and it went great like nothing happened, i havent apologized to him yet..should i or just let it go…i think thats y he hasnt called.