<human>: Can you provide a brief rundown of the text in within 3 sentences?

I've been back on the online dating scene for over a year.  There's been a couple of mediocre hookups but no relationships.  Ideally I'd like a relationship but I'm open to casual sex while I look because, well, I have needs.  

My problem is that I'm getting increasingly disappointed by my interactions with these guys.  A surprising amount of men who are already in relationships contact me and that has started to make me feel suspicious of everyone else.  I hate that.  I don't want to accuse an innocent guy of being a cheater.  Another overwhelming problem is "pic collectors" (guys who say they wanna meet up but don't and continually ask for more pics).  I also am disappointed by the sheer lack of effort.  I mean, even if I say I just want a FWB type of thing, I feel like they forget I'm even human and just bombard me with nonstop graphic sexual talk.  If I say I want a relationship then there's still lack of effort in just making basic conversation.  I try to offer up info about me and ask open ended questions and I get back "lol yeah" or "haha".  Some accuse me of catfishing and posting fake pics.  Some back out right before meeting.  The most promising prospect I've had was a guy who I really like and told explicitly I wanted a relationship with, but lead me on for months (my fault, I should've ended it sooner).  Each time I start talking to a new guy I try super hard to forget all my past bad experiences so I don't give off a bitter vibe, but still no luck.  I know I need to take a break from online dating but I feel like I wanna be "available" to as many people as possible. After another upsetting exchange with a guy I thought I really liked last night (he got very shady about when/where to meet up for the first time) I just felt so angry and bitter.  I know there have to be decent guys out there but I haven't met any yet.
<bot>: After over a year of online dating I'm becoming increasingly wary of men.  How do I maintain motivation to keep dating and prevent becoming bitter?