How do you guys combat the jealousy/discouragement/etc you feel when your FP is giving someone else attention?

I know logically it's *okay* that he has other friends, and he does give me quite the hefty amount of attention. But I can't help but feel discouraged when he tells me he's with other people. I try to distract myself so I don't do/say anything impulsive (I actually think I handle myself quite well *to* him), but on the inside, I'm far from okay.

Is it enough to just tell yourself that you're being irrational? I have other friends too, and I can imagine he "doesn't care" on the rare occasions that I hang out with said friends.