<human>: This is gonna be long winded but i need some advice asap.

I have just turned 29. I have been single for 7 months. Before this I had a girlfriend for approx 7 years. 4 of them we were fuck buddies, then a year after we were fuck buddies but with no one else. Then I broke up with her fearing commitment. We split for 2 months then I ran back to her and asked her to be my girlfriend. 

7 months ago I started getting bored, I was depressed and going no where in my life and she loved me more than anything. Saw marriage and kids in our future. I panicked and broke up with her to sleep around again. I thought I was fine with all this but then the last few months I missed her and realized I threw away what I would consider a soul mate.

She said no. she couldnt get hurt like that again (she was in a really bad way)

So now in this last 7 months I have had sex with maybe 15 different people. Nothing more than just sex though. I have a few that have stuck around for a "booty call" when I need it. And as of last week I have got myself in an awful situation.

I have been seeing a married woman who isnt happy in her relationship. She tells me its no strings fun. But its all playing on my head. I feel awful. I dunno what I should do. I wish I never broke up with my ex and now I sit at home alone. Feeling depressed. When I meet up with a girl it puts it all out of my head but when I am alone I feel worthless.

The girls that I have been seeing for sex are nothing I could imagine dating. In fact I cant imagine dating anyone but my ex who has told me no. She told me maybe in the future we can be friends or who knows maybe give it another shot. Which I doubt. 

What do I do?

The married woman has two kids and is planning on leaving her husband after xmas (not due to me) as she isnt happy. But I cant help but put myself in his shoes. I was cheated on before and it broke my heart.

Can you summarize the given text in a few sentences?
<bot>: I feel nothing for the people I am sleeping with, I miss my ex, and have become a home wrecker. I think I am depressed :/