Wild stuff DR. Can't even imagine the loss of a SO. You are going to have to cope with controlling that array of feelings if you want to move on and play the singles game.
You DO have something some people don't have: friends. And you should feel blessed as they look like they're fun dudes, be thankful for them.
Pro Tip: STOP fooling yourself into believing you have nothing to do. And even if you don't, stop vocalizing it!!
There's PLENTY to do, you've got a list and you're a busy man, and you're so busy you don't have time to be texting blondes on a Sunday...ya hear? Beautiful babies ain't fly on kickin' it with dudes who have nothing to do. You're here on this beautiful planet, you're a busy stud, and you know it. You have a strong heart that's beating on Gods green earth, it's a beautiful day, and you're gonna make the most of it. You don't have time to deal with women. If you're gonna take time to let some blondie slide her way into your busy day, so be it, but it should be on your time, not hers. Coffee next week? "Sure, but Fridays my only free day." If she says Thursday let her know its not gonna work because it conflicts with your monthly "guys night at the bar." If she can't find a way to make time to see you, maybe that's a sign.
There is something each and every one of us has, male or female, and that is VALUE. How you demonstrate your value is up to you.