My 'love' life is stressing me out.

Me and my friend Josh had this little thing. I thought he might have had feelings for me, but I was wrong. I asked him if there could be anything serious between use (like a relationship) and he laughed at me. He told me I was crazy for thinking that and that I wasn't his type.

My ex-boyfriend, Chris, is trying to get back together with me. We broke up after I found out he cheated on me with 5 other girls! I really do like him, but he hurt me more than he had to. It hurts every time he tells me he's sorry and that he misses me. He told me that I was the best girl he's ever had. He tells me that he loves me and wishes I would give him a second chance. I would give him a second chance, but I know how he is. After we broke up he started dating his ex-girlfriend (the girl he was with before me) only a week later!! I'm so hurt right now and I don't know what to do.
I want Chris back, more than anything, but I know he will only hurt me again. I miss him so much, and I feel like I'm stupid/weak for missing him. I don't know how to handle my feelings. Should I give him a second chance?

My ex-girlfriend, Kelly, (yes, I'm bisexual. please don't judge) is flirting with me. She will randomly act like she did when we we're dating (holding me, the way she talks to me, ect.). I just don't know. It's like she wants me back, but she says that she only sees me as a friend now. Then, she'll just start talking about when we used to date. She says that I'm the only one she'll ever date again. It's so confusing.

I just need some advice or even just a hug. I feel so confused and hurt. I don't know how to handle my situation with Kelly or Chris.

Please help me