Love is unlimited. Resources are not.
You may be able to love five different people at once, but that doesn't mean you have enough resources to maintain that many relationships successfully. There are only 160 hours in each week, and each partner requires time and affection to maintain healthy connections. Don't forget about the actual costs of dating. All those dinners and movie nights can add up fast. So while your love for all these people may be sincere, you have to balance those romantic feelings with what is practical in the real world.
After looking at the cost/benefit analysis of all your romantic entanglements, you might find in the end that fewer is better.
Compersion is possible
Compersion is the feeling of joy someone gets when they witness their love being well loved by another. It's the opposite of jealousy. It’s the kind of emotion that fills your heart to the brim and overflows love into a relationship. It's not easy to reach -- more like trying to experience nirvana.
But when you arrive at compersion, there's almost nothing better. It happens when everyone in the relationship has their needs for time, affection, and attention met; and when everyone is confident that his or her relationship is secure. It happens suddenly. The first time it happened to me, I watched my boyfriend kiss my girlfriend, and the look of peace and contentment on their faces brought me to tears.