I recently broke up with my boyfriend. It started out as a mutual thing because he was being annoying and sarcastic/manipulative, and then a few days later he wanted to get back together (and claimed to have changed), but by then I had met someone else. I had only met this guy, though, I hadn't started dating him. Anyway, one weekend this new guy kissed me and then it happened again the next day. I like this new guy a lot, but the point is, I'm still in love with my ex. I told my ex about the new guy to come clean, and he was very hurt. Now I don't think there is any chance of us ever getting back together (I thought maybe years down the road we could reunite, but maybe not). I like this new guy, but now that my ex is out of the picture, I'm getting very nervous about whether or not this new guy will stay interested. I can hardly do anything.
How long ago did you break up? Even a mutual break up is hard to take. I just went through one and didn't sleep or eat for over a month. At some point, you have to stop and think about all the reasons why you broke up. If it was mutual, then clearly you both knew something was wrong. Just stop and think about it and you'll start to realize why the break up happened and you'll remember all your reasons. Eventually you'll get over it, but you need to take the time to get over it before you start with someone else, or it'll be a mess. Right now, just take of yourself and don't worry about your ex or the new guy. Whatever is meant to be will eventually work itself out. Just worry about yourself for now.
Even if a break up is mutual it still takes time to 'get over it'. I think you need to sort out your feelings for your ex first before you can have a relationship with someone else. You don't want to be hung up on your ex because that will only hurt your new relationships. You can't still be in love with your ex and expect to have a good relationship with this new guy if you love someone else more.
When one of my ex's I really liked broke it up with me, it was very sad. I was pretty sad for a while. I actually cried and didn't eat for a while as well. but you will eventaull get ove rit with time and healing. If you haven't healed yet, I wouldn't jump into a new relationship righ away and take it slow. You're still in love with your ex, that is kind of problematic. You should start with a clean slate so you don't end up hurting this new guy or hurt yourself.
It seems like you are only missing your ex because you are worried about this new man staying interested. Maybe it's not so much about your ex as it is you wanting someone there for you? It's understandable and I just went through the same thing. It took me a long time to realize I wasn't sad my ex was gone, I was just worried about the future. DON'T WORRY ABOUT THE PEOPLE FROM YOUR PAST, THERE IS A REASON THEY DIDN'T MAKE IT TO YOUR FUTURE!
Maybe the best thing for you to do is tell your ex and this new guy you need some time alone to figure out your feelings. When you know how you feel and if the new guy is still waiting for you or not, then you will know what to do.