So, the person you like likes you and another? Okay. Get over him. Doesn't seem like relationship i'd want to get into...
You want to be the one and only. Trust me
kick them in the nuts!
Ask them if they are interested in chosing the relationship you want with them. If not then at least you have presented your feelings openly & honestly and can then chose to be friends or walk away acording to your needs.
Just look that lucky guy girl , feel jealous and quit it
Its not worth the heart ache someone will be dropped at some point.
This would make a good song. Or a chick-flick.
Depends on you and what you want. If you are looking for a monogamous, long term relationship leading to marriage, then you are looking at the wrong person. If they will not commit and be faithful, now, then they never will.
If this person is just "practice" and for fun, then what does it matter if he spreds it around?
Either accept it and stay with them, or leave them.