<human>: I love my girlfriend, and I like to see her happy. However, sometimes I'm not so happy, too put it lightly. Whenever I tell her that something is wrong she, understandably, worries about me. As a result, I sometimes try to hide my sadness from her.

She doesn't make me feel guilty for being unhappy, and she always tries to support me when I do say something, but I really don't like to make her sad. 

While you may be tempted to just tell me to say how I feel, and I know that's probably the logical course of action. However, I'm not sure if keeping my problems from her does me any actual harm, and I worry that telling her could actually harm her (she's had a few mental health issues herself), so I'm not so sure.

The way I see it, I have three options:
1. Stay the course
2. Start telling her when I'm sad from now on
3. Tell her why I haven't told her yet  

Which looks like the best course (I have a guess at which one, but I'd like to hear it from a bunch of people)? Also, is there anything else I should do?

Could you distill the essence of the text into 1-3 sentences?
<bot>: I don't like to tell my girlfriend when I'm unhappy because it really effects her. I'm unsure whether or not I should