SUBREDDIT: r/relationships
TITLE: Me [26 M], permanent grass is greener syndrome. Help please.
POST: I will try to keep this short and sweet. I am simply looking for any advice that y'all will give me.

I am a 26M and currently casually dating 24F.

Here lies my problem. I get a lot of attention from girls - a lot. I realize I am attractive as well, so that doesn't help the situation. I constantly feel like there is someone out there better for me. I don't know if this is truly because I'm unhappy with who I am dating, or because I just 'think' I can do better. I have never cheated on anyone I have dated, and honestly, I haven't dated that much anyways. So here's my question: how do I get over the hump of having a big head from constant attention so I can devote my attention fully to who I am currently with?
TL;DR: 
I am an attractive male. I don't want to feel like the grass is always greener with current partner. Any advice appreciated.