Libras love being loved and if he isnt getting what he needs form his current gf then he'll look to get it elsewhere...this can be just purely flirting to boost his self esteem or in some cases sex...but whatever, it's for his benefit and satisfaction...not yours! Be careful!
Also because he is feeling down and out with his family situation and you know him and them more than perhaps his current love, he's wanting your shoulder to lean on...not considering the consequence of his actions...after all, it's all about him remember!
