Relationship anxiety is basically constant and overreactive jealousy and a constant need for reasurrance from your partner. It's like you're constantly worried something terrible will happen and you feel like you NEED to know if your partner is still interested or only wants you. It's like an override on jealousy. People disregard is as obssession, but this could be a big deal in your eyes if you feel like this could be the one thing to ruin what you have. I suggest sitting down with your partner and talk about your concerns (about yourself and the relationship) and think about a relationship counsler. If this doesn't help, ask a therapist more about it or do a little research. Good luck :)