My boyfriend was texting another girl inappropriate messages...

Me and my boyfriend have been together about 3 years and lived together for one year. Things have been pretty great, or so I thought, until a girl messaged me on Facebook and sent me her and his conversation. They used to mess around along time ago and he was texting her asking if they were going to have sex again and things like that. She got mad because everyone knows we're together and sent it to me. Well when we talked, he was apologetic and crying for forgiveness and doesn't blame me if I want to end our relationship. We started talking more about our relationship and he announced to me that he feels lonely and unwanted a lot and so I'm thinkinghe was texting her for attention. It doesn't make it right but should I give him another chance? We have many future plans together and now I'm so confused and scared that if I give him another chance it may just happen again? Can I get a guys opinion on why he would do that? he tells me he is in love with me and begs for us to still work things out so it doesn't seem like he wants out. advice please :'(
+1 y
might I add she lives 2 hours away from us and me and him pretty much always know each others whereabouts and I don't know when he would have had time drive down there :/
My boyfriend was texting another girl inappropriate messages...
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