I think it's natural to have crushes on people. Just because you're in a relationship, doesn't mean that the part of you that feels attracted to people is set to your partner. I've had other crushes, because they're fun to have, but I don't want to do anything about them. Mainly because they're only crushes, and aren't anything special to me, and because I hate the thought of being with anyone other than my partner. You can handle your crushes in a few ways; try and get over them, or have them and keep them low key because they're fun. You may not feel as attracted to your partner, because your relationship isn't in the 'new' stage anymore. Falling in love comes quick, but staying and being in love is steady, with some sparks. Maybe find something new to do with your partner and get a spark up again? But anyway, I think crushes are fine as long as you know you want to stay with your partner and not act on your crushes. They can only go so far before it breaks your relationship.