He acts like he likes me then he acts like he doesn't!

There's this guy that has a girlfriend but we've been texting constantly and I thought he liked me and my best guy friend told me he did after I told him the "signs" I saw the guy I like give me but now he ignored my text today.

i have been texting him a lot lately so that might be it. but he never texts me but if I text him we talk for hours!

i know I should just back off but I can't stop thinking about him but I don't want to think about him anymore!