Marriageadvice?

I have a small issue if it could be small. Listen I know sex isn't the most important thing in a marriage. We are good on the emotional aspect of our marriage, except what is going on now. We have sex like once a month, this goes on for months at a time and then I say something and then he's like okay and we do it a couple of times in one week and then it goes back to the same thing until I say something again. I'm tired of it, it's been going on for years. What else do I do? I have needs and they aren't being met. Like I just need it like a couple times a week and it's not like it'll last more than 30 min but like I don't know is it too much to ask? It's not like I'm asking for it everyday. It's starting to make me angry and I'm just so upset by it and it's not like I haven't actually talked about it. I don't beat around the bush. Oh guess what else. We have an open marriage as well. You wanna know who wanted it? Guess. Not Me, he asked me like 2 years ago and I didn't like the idea but then I agreed and we've been open ever since. I never really talked to anyone else except for him cause I really love him a lot and I only want him, but lately I'm kind of over it and I've met one guy and it was okay, I cried after cause it wasn't my husband and I only wanted him that was like 8 months ago. I don't know what to do I felt like I've done everything. I need advice please...
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