Hi Marshellette, I'm thinking that maybe you haven't really given yourself the time and space to work through your breakup?? And it really isn't that long since you split considering your feelings for them and the length of time you were together, is it?
While it's really good that you've tried moving on somethings you just can't replicate. Although that's not to say that you can't still gradually move on in time, put the past more behind you, and even find a much better relationship. It may not seem like that now- but just know that it is possible!!
And while you're going through the pain from your breakup and vivid memories of what you had (?) you are unlikely to feel as much for the new guy. In fact you're unlikely to feel as much for anyone else right now. It's maybe not as much about him/them it's more about what you're going through and once that eases a bit then maybe/maybe not you're going to find that you care just as much/even more about the new guy. But if not him then someone else.
So maybe allow yourself to acknowledge that you had something good, but aim on coming to accept that it's not there anymore (somethings just aren't meant to be), and there can be more out there. I know that may sound much easier said than done and if you're fighting some depression.........but maybe do all you can for yourself to work through the feelings themselves and the situation right now.
If the new guy is a comfort then that's great if you can see him as just that right now and it can help a lot sharing the way you're feeling and getting support from others. But maybe extend that into doing different things too (instead of just "sitting around his grungy apartment,,,,,,,,,") with or without him a bit at a time.
There are going to be other chances out there when the time comes and when you're ready for them.
Best wishes
Alison
P.S. About the age difference. That really needn't be an issue if you two do really get it together in the future. I'd say it's much more about the connection, and if anything his "level of maturity". Some 22 year old's can be way more "mature", understanding, caring, supportive.........you get the picture?? than some 30, 40, 50 year old guys. It just depends on the person.