Relationships

Is it normal to love someone, and still doubt or overthink that relationship at times? I feel as if the good times are so good that I can go through any bad time just to have the good, but then when the down times hit, I feel so hopeless its depressing. During that time I get very weepy and detached from people. This can happen at any time of the month, it makes me feel crazy, this only started happening about a month ago. I love him, I want a future with him, I believe I could reach that future with him, but it is SO hard with these swings.

I am 16 and I just want some advice from someone who might know how I feel.

Another thing is I want to work on our communication, I want to learn more about him and vise versa, I've been dating him for 7 months, so I want to learn more personal stuff if he let's me, could that be it? Communication? Or hormones? Or anxiety and over picking at it? Because it started out happening on a monthly schedule, but I feel like now I'm just worrying, but there isn't anything to worry about... I'm just lost and need some encouragement