Was he ready to be in a relationship???

My bf & I have been dating for 2months now & his ex gf of 2 years called him & said she needed help & had no one else to talk to they broke up about a little over a year ago & he told me he had not talked to her since then but I dont understand why after so long she would just call him specially when things didnt end well between them & what really upset me was that he met up with her to talk because she needed to talk to someone he told me that he only went because if she killed herself or something he didnt want to feel like he could have done something & didnt but it really bothers me that he would go knowing that I wouldnt be okay with it because of the history they have & because he claims he hates her I feel like he just made her feel like he will always be there for her despite having a gf & thats just not okay with me I feel like maybe he wasnt quite ready to start a relationship with someone else maybe he wasnt completely over her & theres still something there. Am I overreacting?