What should I do? I've been in a 5 year relationship and I think about other guys constantly.
Why do you think about other guys?
They are so good looking, they are always the ones who are nice to me. I wish I could have them
I think that if you are constantly thinking about being with other men you should consider ending the relationship you are in. It doesn't sound like your heart is in it.
It's not like he's losing, he can have fun too. I'll breakup when I want to.
I just think either you should work on the relationship you are in to find that spark again, or consider ending things. That way, he isn't hurt in the long run.