No progress in months usually means that you aren't using LoA in your favour or at least that's what I think.
We can't make decisions for you of course, but it is always easier to manifest a new relationship, because you have no bad feelings attached to a new relationship. So, when it feels right to you to go for a new relationship, do it. But if you haven't learned how LoA really works, chances are that you screw up again, because you fall back into old patterns of thinking and the same things happen again and again.
There are a few points in your post that show where you are going wrong and why it isn't working for you. When you are tired and try hard and your journey includes a lot of effort, you can't reach your goal, because your focus is in the wrong place. As long as you want your guy back, as long as you look for progress, as long as you see that nothing has happened yet, you aren't in the right vibration to have success. You can either decide to invest some more time in learning about how LoA works and align with your love or you can go for a new guy, that's your decision.

I was enjoying my visualizations and my daily activities, my life..so, i don't think i was trying hard..

It's hard to tell without knowing your thought processes. I just concluded that you are trying hard, because you said you are tired. I may be wrong with this.
What I can tell from my own experience is that when I visualised to make something happen, it made me tired, it felt like a chore and I really didn't enjoy it at all. I just did it, because I hoped to get something out of it and that never works. Since I don't do it to get something out of it, I enjoy doing it. It's no longer that I sit down at 3 pm to visualise. There are days I do it twice, because I feel that I would enjoy it and there are days I don't even think about it, but it's really just for the enjoyment.
Enjoying life sounds as if you were on a good way. What holds most people back is that they still pay attention to their reality. They think about what was, what is and what they hope will be and by doing that they perpetuate their reality. How much attention do you pay to your reality?