I don't know if I want to date anymore?

[Josh]

So me and this girl have been going out for about a year and half and for the past 4 months I've been really not feeling happy but I thought you never know what you have till it's gone. So I've been really trying to make things work but I just don't feel happy and feel so controlled like if I go out at all I have to text her 24/7 or she gets mad at me. Or if I don't reply every two minutes she gets mad or if I don't put a couple smilies in texts she thinks I'm mad at her. Along with that I have do much stress with school and getting life on track with my job. I mean she is a great girl but very controlling and we've talked about it before but now it seems even if she were to change I don't know if I'd want to stay. Any advice? If you think I should break it off what would be something that wouldn't hurt her feelings?