How do I deal with the loneliness?

I'm a 28 y/o man who has just in the last week found out that my wife has been making out with multiple guys behind my back. She claims there has been no sexual contact other than the kissing. We've been together for 4.5 years and married 1.5.

A little bit of the background: for the last few months she has been in a constant state of "I don't know if i love you anymore." This past week she decided to stay at her parents house for a night. That night sitting alone at my house I began getting paranoid about infidelity i ended up looking up a number in which she had an hour long conversation. The number happened to be one of my co-workers and I drove 40 minutes to his house to find her there with him. She went back to her parents house and I went back home. The next day she showed up after work and eventually admitted to a total of 4 guys that she has made out with, but not had sex behind my back. Tomorrow I go to my lawyer's office to start setting ups the divorce paperwork, she has no idea and thinks there may be a chance to salvage our relationship.

The biggest problem right now is the feeling of loneliness and emptiness as I am staying at my house alone while she stays at her parents house. It seems as if I will never be able to trust someone again because I really did put 100% trust in her and that was broken.

This is all still very fresh and I feel like it's going to get worse before it gets better. The positive is that we had no kids; only a dog. I'm young and there is still time for me to find that someone that will make me happy. I have an incredible group of friends that are extremely supportive of my decision to follow through with the divorce. I'm just looking for advice on how others dealt with their individual situations and what steps I should be taking to get my head back on straight.