<human>: We've been dating for a little over a year and a half and it's been nothing but amazing all the way through. Maybe only a couple arguments which were settled within a day or two at most, but I've always been able to be myself with her and never has she given me a reason to distrust her or want to break up with her. Yet recently I've started having these sort of battles with myself over wether or not I want to stay in the relationship..

It often results to me thinking of her with other people which always bothers me (a lot). She's always been loyal and I know she loves me for who I am, and I love and respect her more than any girl I've dated and I would never dare cheat on her nor would I ever want to hurt her. Yet occasionally my mind will begin to wander off and think of other opportunities or other experiences with other people, and then I question whether or not I really love her or if I'm just scared to lose her.

It's almost like my mind just completely flips. One minute I feel like I've hit the jackpot and met the "perfect" girl, and then the next minute I'm questioning my feelings toward her and the relationship in general. This has been going on for maybe the past 3 - 4 weeks, constantly switching back and forth, and I think it's starting to affect me emotionally, making me confused and sometimes unhappy.

It's also tough because she's never once given me any sort of a reason to want to break up with her. She's always been there, always cared for me and cared what I thought. She can practically read me like a book, knowing pretty much what I'm feeling at any time and acts upon it (positively). She even completely quit smoking cigarettes for me because she knows I don't like them (She wasn't a heavy smoker, but she'd often bring up her craving for a cigarette). This is all part of why I respect and love her so much, making it hard for me to even imagine ending things with her..

Any sort of insight would be much appreciated, thanks!

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Half of me wants to explore other women and other relationships while the other half of me couldn't imagine leaving my girlfriend.