feeling pretty low today

Im usually ok in the mornings and as the day goes on i get more depressed,then at bed time thats when i find hardest.I went out for a girlie night out and at first i really didnt want to go but i enjoyed myself(apart from missing him when id had a drink).
Also my daughter went on holiday with her friend last night and im going to miss her loads.Im so tired today i just cant wait to go to bed tonight.Im still wondering what hes doing its his weekend to have his kids and that means he would have seen her and its funny he hasnt been online for 2 days.
Oh well why should i care what hes doing?