Nicotine withdrawal is a pain, but it won't last too long.

Before I was dating my now-husband, I dated someone who was coming out of a nasty divorce and didn't want a committed relationship. That was hard because I fell in love with him and ended up pissed off with his behavior. He was a trigger for me, and I struggled a lot with the feelings. Thankfully I'm not seeing him anymore and I found a stable relationship even though we both have issues.

I don't think a casual relationship is a bad deal. It just didn't work out for me.