Boyfriend weigh issues

Ok so my boyfriend of three years wants me to get in better shape or he's gonna dump me.

When we first started dating we worked out together and soon I just didn't have motivation because I've never worked out in my life and have been 120 lbs. I'd rather do physical labor outside. I hate home workouts.

Without him I wasn't motivated to go to the gym and he got tired of trying to get me to go to the gym and eventually hasn't gone to the gym with me because I've been trying to get more active with my horse and the weather hasn't been good and with my work schedule and home life it's hard. I went on birth control and I began to loose weight. Went off and got pregnant, miscarried, and got depressed about myself and how I look because of weight gain.

I'm now 138 and I don't look good in the mirror to myself at all. On the bmi scale 5 ft and 138 is overweight.

I've been watching what I eat, trying to be out and about but lately I've been working alot from 8-7 and on the days I have off I'm trying to see my horse or him. I'm trying to train my horse but the ground is too wet to work and I'm depressed about that. I don't like the gym and I'm stuck watching my grandma's dog with a very specific eating and bathroom schedule.

I don't know what to do I'm getting very depressed about myself due to the fact that my mom and my boyfriend are making comments about the way I look.