I've been seeing this girl for about six months now. I've started to get oneitis for her.

She is seeing another guy and even though we have sex regularly she does more things with the other guy. I'm beginning to feel like I'm just the fuck buddy.

I've decided it's time for me to see other girls too but how do I manage the logistics of it?

Half of my week is filled with the gym which leaves little time for anything else

She is with me on Friday nights and sometimes during the week. which is prime time for new ventures. If I don't invest time in her I might lose her. If I do then then I lose out on going to other social activities

How do you guys manage seeing girls and going in for new ones? I'm having trouble with just one, can't imagine how people juggle multiple