<human>: This post is not a troll, promise.

25/M here. Been in a relationship with a 22/F for three years now.

We live together and, in all, have a really happy life. Our sex life has never had any serious issues. However, my problem is this:

In recent months I have found myself becoming sexually aroused/ excited by and interested in the thought of having sex with other women. I don't desire my GF less; I love having sex with her. I simply have this concurrent 'desire' to...well, fuck other women. The desire itself its purely physical. I am not emotionally detached from my GF, or questioning whether I love her. I am not dissatisfied with the sex I do have with my GF. I just can't get these thoughts of having sex with other women (any women, no one person in particular) out of my head.

So I'm wondering: Is this just a phase that will pass or will it simply get worse until I'm seriously tempted? Is this something many people go through over the course of a long term relationship? Is this a sign the relationship is in trouble?

Give me the gist of the text in a nutshell
<bot>: OP (mid-20s male) has been in three year relationship with his girl. Has started to desire other women. Concerned it will only get worse and will ultimately one day be seriously tempted to cheat.